05000219/LER-1982-040, Forwards LER 82-040/01T-0.Detailed Event Analysis Encl

From kanterella
Jump to navigation Jump to search
Forwards LER 82-040/01T-0.Detailed Event Analysis Encl
ML20062C529
Person / Time
Site: Oyster Creek
Issue date: 07/26/1982
From: Fiedler P
GENERAL PUBLIC UTILITIES CORP.
To: Haynes R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20062C534 List:
References
NUDOCS 8208050270
Download: ML20062C529 (3)


LER-2082-040, Forwards LER 82-040/01T-0.Detailed Event Analysis Encl
Event date:
Report date:
2192082040R00 - NRC Website

text

GPU Nuclear

.h g7 P.O. Box 388 Forked River, New Jersey 08731 609-693-6000 Writer's Direct Dial Number:

July 26, 1982 Mr. Ronald C. Haynes, Administrator Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406

Dear Mr. Haynes:

l Subj ect: Oyster Creek Nuclear Generating Station Docket No. 50-219 Licensee Event Report Reportable Occurrence No. 50-219/82-40/0lT This letter forwards three copies of a Licensee Event Report to report Reportable Occurrence No. 50-219/82-40/01T in compliance with paragraph 6.9 2.a.2 of the Technical Specifications.

Very truly yours, ACA Pete'r B. Fiedler Vice President and Director Oyster Creek PBF:lse Enclosures cc: . Dire c tor (40 copies)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Director (3)

Of fice of Management Information and Program Control U.S. Nuclear Regulatory Commission Washington, D.C. 20555 NRC Resident Inspector Oyster Creek Nuclear Generating Station Forked River, NJ 08731 8208050270 920726

{DRADOCK05000 r is a part of the General Pubhc Utihties System p6#

OYSTER CREEK NUCLEAR CENERATING STATION Forked iver, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/82-40/01T Report Date July 26, 1982 '

Occurrence Date July 7, 1982 f

Identification of Occurrence -s s

It was discovered that the signal input was disconnected to one of the safety valve vibration monitors which rendered that acoustic monitoring channel inoperable.

This event is considered to be a reportable occurrence as defined in the Technical Specifications, paragraph 6.9.2.a.2.

Conditions Prior to Occurrence s The plant was on line with an electrical output of approximately 485 MWe (14 81 MW t) . ,

Description of Occurrence Af ter opening the cabinet door to gain acesss to the valve monitoring system elec tronics for the monthly surveillance tesi, it was observed that the signal _

. input cable to Valve Monitor Channel No. 4 was disconnected. (This channel ,_

monitors the vibration on Safety Valve No. NR28-D. )

Ap pa rent Cause of Occurrence Q ,

. t This lead is routinely disconnected in order to.. perform surveillance testing.

A review of the surveillance indicates that the lead was reinstalled following the last surveillance and subsequently either came loose, or was replaced improperly .

Analysis of Occurrence The purpose of the safety / relief valve accident monitoring instrumentation is to alert the operator to a stuck open safety / relief valve which could result in an inventory threate,ning event. _

The actuation of a safety valve presents dif ferent concerns than those related to a relie f valve. The ac,tuation of a safety valve will be immediately detectable by observed incr' cases in drywell pressure. Further confirmation can be gained by observing reactor pressure and water level. Operator action in response to these symptoms would be taken regardless of the acoustic monitoring system status. '

s ws

-N

Licensee Event Report Page 2 Reportable Occurrence No. 50-219/82-40/01T In addition to the above, there is reasonable assurance that the acoustic monitor on the adjacent safety valve would alarm.

Based on the above , the safety significance of this event is considered minimal.

Corrective Action The connector was reconnected. The surveillance test was performed on channel

4. The results indicated the channel to be functioning properly.

The alarm circuit will be modified during the next refueling outage to add a low signal alarm which will alarm on this type of failure.

s

\

i

( s'  %

d :% s"

-s,

~

2

)' .s

\

\

L 4 3 ,

t I