Information Notice No. 90-34: Response to False Siren Activations
UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF NUCLEAR REACTOR REGULATION
WASHINGTON, D.C. 20555
May 10, 1990
Information Notice No. 90-34: RESPONSE TO FALSE SIREN ACTIVATIONS
Addressees:
All holders of operating licenses or construction permits for nuclear power
reactors.
Purpose:
This information notice is intended to alert addressees to potential
problems resulting from lack of appropriate response to false alert and
notification system (ANS) siren activations (false alarms). It is expected
that recipients will review the information for applicability to their
facilities and consider actions, as appropriate, to avoid similar problems.
However, suggestions contained in this information notice do not constitute
NRC requirements; therefore, no specific action or written response is
required.
Description of Circumstances:
Between January 1987 and December 1989, more than 20 false alarms of the ANS
were reported to the NRC. These false alarms were attributed to such causes
as inclement weather, mechanical failure, radio interference and personnel
error. In many cases, licensees and local officials responded to these
actuations inadequately with regard to reassuring the affected public.
For example, on June 2, 1989, at 4:49 a.m., spurious actuation of an
emergency notification siren associated with the Diablo Canyon Nuclear Power
Plant resulted in a high level of frustration and anxiety among members of
the public when they were unable to confirm what action, if any, they should
take. Again, on January 16, 1990, at 11:20 p.m., a 20-minute spurious
activation of an emergency notification siren associated with the San Onofre
Nuclear Generating Station caused a similar reaction.
In both cases, members of the public tuned their radios to the designated
emergency broadcast station (EBS), which did not inform them that the alarm
was false. Members of the public subsequently called the licensee's
emergency phone number listed in their emergency information booklet, but
received no response since that number is only activated in a real
emergency. Members of the public then inundated their local 911 emergency
number, overloading that system and frustrating local officials who also did
not know what was
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happening. Some individuals attempted to call the licensee directly and
some called the NRC Operations Center, with nobody being able to provide
factual information.
Licensees and local officials found, in one case, a failure to develop
effective plans to respond to spurious activations and, in the other case, a
failure by offsite organizations to implement planned responses.
Diablo Canyon completed a root-cause analysis of the occurrence and with
local authorities developed the following corrective actions:
1. A new section titled "Accidental Siren Sounding" was added to the
public's emergency notification booklet. This section includes a
telephone number (manned by company employees 24 hours per day) that a
member of the public can call if he or she hears a siren but can find
no message on an EBS. The new section also asks the public to refrain
from calling 911 when a siren sounds.
2. The licensee developed a training video tape for local officials and
for personnel at all EBSs.
3. Local officials revised their procedures and retrained individuals
responsible for activating the EBS.
In addition, because six spurious activations occurred since 1984, the
licensee decided to upgrade the siren system. The licensee is replacing all
transistors in the sirens because these have been the most frequent cause of
false activations. The licensee is also modifying each siren to confirm
activation if the siren sounds. This modification was considered necessary
because citizens have occasionally confused police or fire sirens with
activations of the plant's emergency notification system.
Discussion:
A similar information notice, Information Notice No. 81-34, "Accidental
Actuation of Prompt Public Notification System," was issued on November 16,
1981. A siren, designed to warn of a nuclear emergency, sounding in the
night would be expected to cause anxiety, which in turn leads to numerous
unnecessary and burdensome calls to the local police, the licensee, and the
NRC. Timely and appropriate response to false alarms can reduce the level
of public anxiety. Failure to rapidly inform the affected public as to why
the siren is sounding raises that anxiety. Local procedures for response to
false alarms have not been established in all cases. Insufficient response
may decrease public confidence that the ANS will perform its intended
function during an emergency.
Addressees may wish to verify that plans are in place to respond effectively
to spurious activation of emergency notification sirens associated with
their facilities.
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This information notice requires no specific action or written response. If
you have any questions about the information in this notice, please contact
the technical contact listed below or the appropriate NRR project manager.
Charles E. Rossi, Director
Division of Operational Events Assessment
Office of Nuclear Reactor Regulation
Technical Contact: G. P. Yuhas, RV
(415) 943-3748
Attachment: List of Recently Issued NRC Information Notices
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