05000219/LER-1982-028, Forwards LER 82-028/03L-0.Detailed Event Analysis Encl

From kanterella
Jump to navigation Jump to search
Forwards LER 82-028/03L-0.Detailed Event Analysis Encl
ML20054J285
Person / Time
Site: Oyster Creek
Issue date: 06/14/1982
From: Fiedler P
GENERAL PUBLIC UTILITIES CORP.
To: Haynes R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20054J286 List:
References
NUDOCS 8206280427
Download: ML20054J285 (3)


LER-2082-028, Forwards LER 82-028/03L-0.Detailed Event Analysis Encl
Event date:
Report date:
2192082028R00 - NRC Website

text

. .

t

  • GPU Nuclear

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

June 14, 1982 Mr. Ronald C. Ilaynes, Administrator Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 Dea r Mr. Ilayne s :

Subject:

Oyster Creek Nuclear Generating Station Docket No. 50-219 Licensee Event Report Reportable Occurrence No. 50-219/82-28/03L This letter forwards three copies of a Licensee Event Report to report Reportable Occurrence No. 50-219/82-28/03L in compliance with paragraph 6.9.2.b.2 of th Technical Specifications.

Very truly yours, Peter B. Fiedler Vice President & Director Oyster Creek PBF:1se Enc losure a c c: Director (40 copies)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Connission 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 (1)

Oyster Creek Nuclear Generating Station Forked River, NJ 08731 V

@206280427 820614 PDR ADOCK 05000219 8 PDR GPU Nuclear is a part of the General Public Utilities System M

OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/82-28/03L Report Date 4

June 14, 1982 occurrence Date ,

May 13, 1982 Identification of Occurrence When Core Spray Pump NZ01A was rendered inoperable, operation continued in a degraded mode as permitted by a limiting condition for operation per Technical S pecifications, pararraph 3.4. A.4.

This event is consi".ered to be a reportable occurrence as defined in the Technical Specifier.tions, paragraph 6.9.2.b.2.

Conditions Prier to occurrence The plant was in steady state operation.

Major Plant Parameters:

Power: Reactor -

1276 MWt Generator - 413 MWe Mode Switch Position - RUN Description of Occurrence on May 13, 1982, during performance of the Core Spray In-Service Test, core spray pump NZ01A was declared inoperable. One of the vibration readings for the pump was in the required action range, and per procedure, the pump was declared inoperable. Until the pump was retested, the pump breaker permissive switch was placed in the off position, thereby rendering the pump inoperable.

Apparent Cause of Occurrence The apparent cause of the high vibration r2ading is unknown, since a system retest using a spectrum analyzer as well as the same instrument used to measure the original vibration data both indicated data which were within procedural acceptance criteria.

Licensee Event Report Page 2 Reportable Occurrence No. 50-219/82-28/03L Analysis of Occurrence The intended function of the Core Spray System. is to provide cooling water to the fuel assemblies in the event of a Loss of Coolant Accident (LOCA). The Core Spray System consists of two identical systems, I and II, each of which contain two redundant loops. Each of the loops have both a main and a booster pump and the associated piping and valves necessary to meet the design flow of the system.

In this case, the event was limited to the loss of a single component in one of the core spray loops. A system retest was performed which yielded data within acceptable limits. Also, the vibration was checked again using a spectrum analyzer, and the results of this check indicated that the pump was indeed operable. Based on this and the fact that the redundant loop in that system plus the other system were all totally operable, the safety significance is considered minimal.

Corrective Action The corrective actions taken at the time of the occurrence were to perform a system retest and to check the vibration readings with a spectrum analyzer. Both of these indicated that the first set of data apparently had an erroneous -

reading. The check with the spectrum analyzer verified that there indeed was not an actual bearing problem. The pump vibration is monitored as part of the In-Service Testing Program, and the frequency of testing will continue to be adjusted based on the data in accordance with the IST Program. The Core Spray j In-Service Test is currently being performed at an accelerated frequency.

I I

t l

l l

l

.,