05000369/LER-1981-038, Forwards LER 81-038/03L-0.Detailed Event Analysis Encl

Forwards LER 81-038/03L-0.Detailed Event Analysis Encl

ML20005A096
Person / Time
Site:	McGuire
Issue date:	05/01/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20005A097	List: 05000369/LER-1981-038, Forwards LER 81-038/03L-0.Detailed Event Analysis Encl 05000369/LER-1981-038-03, /03L-0:on 810402,chemical Vol Control Sys Pump 1A Declared Inoperable Following Appropriate Periodic Test During Initial Fuel Load.Caused by High Differential Pressure Across Pump Due to Impeller Replacement
References
NUDOCS 8106290370
Download: ML20005A096 (3)

LER-1981-038, Forwards LER 81-038/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3691981038R00 - NRC Website

text

_

p

/

, 4-

., p I/, Aly.gIGlQ o;..

Ddxz Powen COMPANY RC Powsm Btnutwo

• • th:,, I' e 422 Socra Cncmen Srazzi, CaAnwrtz. N. C. asa.ia

! i Y sj

,; i.,

• • O/

..w.

o.

..ca. s a.

VICE Pagesesm7 TCttpwoset: Anta 704 May 1, 1981 sec.- m.couCno-3,3..o 3 Mr. James P. O'Reilly, Director U.S. Nuclear Regulatory Commission

' Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Ret McGuire Nuclear Station Unit 1 Docket No. 50-369

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-369/81-38. This report concerns a condition where there was no operable boron injection flow path.

This incident was considered to be of no significance with respect to the health and safety of the public.

V truly yours, f

j, t

William O. Parker, Jr.

RWO:pw Attachment ec: Director Mr. Bill Lavallee Office of Management and Program Analysis Nuclear Safety Analysis Center U.S. Nuclear Regulatory Cosmtission Post Office Box 10412 Washington, D. C.

20555 Palo Alto, California 94303

+?ldElYb

/

uQ. ; 3 g 1991 m

.. b [k%,

\\x

~

1 Is

1. • I P

81062903 %

y

o McGUIRE NUCLEAR STATION INCIDENT REPORT Report Number: 81-38 Report Date: April 21,1981 Occurrence Date: April 2, 1981 Facility: McGuire Unit 1, Cornelius, N. C.

Identification of Occurrence: No operable boron injection flow path Condition Prior to Occurrence: Mode.5, Initial fuel loading Description of Occurrence: After being repaired, Chemical and Volume Control (NV) Systsa pump 1A did not meet the requirements of a periodic test which would have declared it operable. While troubleshooting the pump the other operable pump (13) breaker was racked out (disconnected) per Technical Specification. 3.1.2.4.

Thus, no operable boron injection flow path existed.

This was reportable pursuant to Technical Specification 3.1.2.1.

Apparent Cause of Occurrence: The impeller in NV pump.lA had been replaced which caused the differential pressure across the pump to be higher than expected.

Analysis of Occurrence: A work request was written to repair leaking mechanical seals on NV pump 1A.. When the seals were removed, the impeller shaf t was damaged such that a new impeller was required. On April 1, 1981, at 1422 hours0.0165 days <br />0.395 hours <br />0.00235 weeks <br />5.41071e-4 months <br />, a periodic test (Centrifugal Charging Pump 1A Performance Test) was performed in order to verify ptump operability. This test is performed every 31 days and af ter repair, replacement, and/or significant servicing of the NV pumps to verify pump operability.

Curing the performance of the test, the pump began heating up.

It was stopped and the test secured at 1515 hours0.0175 days <br />0.421 hours <br />0.0025 weeks <br />5.764575e-4 months <br />. The cause of the pump heating up was thought to be tight seals.

In addition, NV pump 1B breaker was racked out (disconnected) during the test per Technical Specification 3.1.2.4 since the Reactor Coolant System (NCS) cold legs were less than 300 F.

After Maintenance personnel checked the seals and determined that pump LA could be safely operated, at 1945 hours0.0225 days <br />0.54 hours <br />0.00322 weeks <br />7.400725e-4 months <br />, the periodic test was again per-formed.

However, the differential pressure across the pump was approximately 140 psig higher than expected. No heating problems occurred and the test was secured at 2236 hours0.0259 days <br />0.621 hours <br />0.0037 weeks <br />8.50798e-4 months <br />. NV pump 1B breaker was again racked out (dis-connected) during the test.

NV pump 1A was not technically operable during these test runs but since the pump was being tested to verify operability, personnel decided t hat a Technical Specification item was not required.

The NRC inspector indicated this was acceptable as long as the operable pump (IB) breaker was racked out (disconnected) just before the test and racked back in after the test was completed.

l I

i 1

l l

L

. The.next day, April 2,1981 at 1130 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.29965e-4 months <br />, NV pump 1A was started for troubleshooting by an Operating Engineer and was stopped at 1338 hours0.0155 days <br />0.372 hours <br />0.00221 weeks <br />5.09109e-4 months <br />.

Since NV pump 1B breaker was racked out (disconnected) per Technical Specification 3.1.2.4 and pump,1A had not yet been declared operable and was not being tested, there was no operable baron injection flow path.

Corrective Action

. The periodic test; Head. Curve Verification was per-formed to verify NV pump 1A operability. NV pump 1A was declared operable and at 2222. hours NV pump 1B was restored to service and pump 1A breaker was racked.out (disconnected).

Safety Analysis

Technical Specification 3.1.2.4. required that only one NV pump could be operable when the NCS cold ler,s are less than 300 F.

Technical Specification 3.1.2.1 required.that at least one boron injection path be operable. The only way to declare NV pump 1A operable was to run it for testing. While the pump was being operated,. no core alterations or positive reactivity changes occurred and,~since there was only new fuel in the core, plant safety and the health and safety of the public were not affected.

If the reactor had been. at power, Technical Specification 3.1.2.4 also required that two charging pumps be operable or the plant must be shut-down within the next 78 hours9.027778e-4 days <br />0.0217 hours <br />1.289683e-4 weeks <br />2.9679e-5 months <br />.

i 1

1