05000280/LER-1982-068

LER 82-068/03L-0:on 820614,fire Detection Sys Discovered to Have Lost Program,Rendering Sys Inoperable.Probably Caused by Voltage Spike in Sys Resulting in Loss of Program.Sys Reprogrammed & Verified Operational

ML20055B778
Person / Time
Site:	Surry
Issue date:	07/14/1982
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20055B760	List: 05000280/LER-1982-068 05000280/LER-1982-072, Forwards LER 82-072/03L-0 & 82-068/03L-0
References
LER-82-068-03L, LER-82-68-3L, NUDOCS 8207230293
Download: ML20055B778 (2)

LER-2082-068,

Event date:
Report date:
2802082068R00 - NRC Website

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, ATTACHMENT 1

• SURRY POWER STATION, UNIT NO.1 DOCKET NO: 50-280 REPORT NO: 82-068/03L-0 EVENT DATE: 06-14-82 TITLE OF THE EVENT: Inoperable Fire Detection System

1. DESCRIPTION OF EVENT:

With Unit 1 and Unit 2 at full power, the fire detection system was declared inoperable as a result of indications on the Operator Control Module. Upon further investigation, it was determined that the fire detection system had lost its program, which rendered it inoperable. This is contrary to Tech.

Spec. 3.21.A.1 and is reportable per Technical Specification 6.6.2.b(2).

2. PROBABLE CONSEQUENCES and STATUS of REDUNDANT EQUIPMENT:

With the system deprogrammed, a fire in the areas monitored by the detectors would not have been indicated in the control room. However, the fire suppression systems in these areas were not affected and remained operable, and hourly walkdowns were performed during the time the fire detection system was inoperable. Therefore, the health and safety of the public were not affected.

3. CAUSE:

The exact cause of the event has not been determined. A discussion with a representative of the system manufacturer suggested three possible causes for the system memory loss; a total loss of normal and battery backup power, manipulation of switches within the O.C.M. or the Central Processing Unit, or a voltage spike in the system. No indications implicating these causes could be found. However, the possibility of a voltage spike does exist since there are no protection devices in the system to prevent such an occurrence. An investigation will continue in an attempt to determine the exact cause.

4. IMMEDIATE CORRECTIVE ACTION:

l Hourly plant walkdowns were performed to monitor the affected areas.

5. SUBSEQUENT CORRECTIVE ACTION:

The fire detection system was reprogrammed and verified operational.

6. ACTION TAKEN TO PREVENT RECURRENCE:

The results of the investigation will determine if any future action is required.

7. GENERIC IMPLICATIONS:

None.