ML20024D603

LER 83-071/03L-0:on 830621,during Surveillance Testing, Diesel Generator 2G002 Declared Inoperable When Generator Failed to Start.Caused by Closed Air Supply Valve MU082. Valve opened.W/830721 Ltr

ML20024D603
Person / Time
Site:	San Onofre
Issue date:	07/21/1983
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
LER-83-071-03L, LER-83-71-3L, NUDOCS 8308050316
Download: ML20024D603 (6)

Text

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o2 lWith the plant in Mode 5 and during surveillance testing in accordance with I loisll Procedure S023-3.23, Diesel Generator 2G002 (Train A) was declared inoperable at I lo l4 l l 1009 when it failed to start. Since boration equipment (i.e., HPSI and charaina l o 5 l pumps) was either aligned to Train A or out of service per procedure, inopera- l J o ls ll bility of 2G002 resulted in no operable boration flow paths powered by emergency l lo l7 l l power sources. There was no impact on plant operation or the health and safety l lo is l l of plant person _nel assoc _iated with this event (See Attachment I for information..l 7 .

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. u o IG l 11 010.,l CAUSE OESCRIPTION AND CORRECTIVE ACTIONS h i o l Diesel Generator 2G002's failure to start was due to air supply valve MUO82 beinal j i j i l l closed. This valve is located on the air supply line to the set of air start l i 2 I m'otors on Engine #1 for the Diesel . (See Attachment II for additional informa- l

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ATTACHMENT I TO LER 83-071

- SOUTHERN CALIFORNIA EDISON COMPANY

, SAN ONOFRE NUCLEAR GENERATING STATION UNIT NO. 2, DOCKET NO. 50-361 The following information is provided in accordance with surveillance Requirement 4.8.1.1.3 And Regulatory Position C.3.b of Regulatory Guide 1.108:

1. The diesel generator involved was 2G002.

2. This was not considered a failure of a valid test since it was attributed to personnel error associated with performance of the test. Therefore, the number of failures in the last 100 valid tests remains at 2.

3. The diesel generator is started by eight air-start motors, arranged in two trains, with an isolation valve in the air supply to pairs of motors. Thus, there is a total of four isolation valves; two in each train. In accordance with Procedure SO23-3-3.23, at the beginning of the test, Train

. B was removed from service by closure of two of the four isolation valves. The diesel generator should have started successfully on the four Train A motors. When it did not, investigation disclosed that two of the Train A air-start motors were isolated by inadvertent closure of isolation valve MUO82. Valve MUO82 was opened, and the diesel generator was successfully started on the Train A air-start motors.

Following the previous surveillance test on June 9, 1983, all four isolation valves supplying the eight air-start motors were verified to be open. This verification consisted of an independent second line-up verification in accordance with Procedure SO23-3-3.23. A review of Equipment Control work history files revealed that no work had been performed on 2G002 from June 9 to June 21, 1983.

It is considered most likely that MUO82 was inadvertently closed during the line-up to conduct the test on June 21 as similar valves in Train A were then deliberately closed.

4. As there is also the possibility of an unauthorized manipulation of MUO82 between June 9 and June 21, 1983, the seriousness of unauthorized valve manipulations has been re-emphasized to operating personnel. Also, Special Order 83-39, which responds to IE Bulletin 83-27 and details action to be taken when misalignment of a system is discovered, was implemented. No other misalignments were noted.

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U ATTACHMENT I TO LER 83-071 SOUTHERN CALIFORNIA EDISON COMPANY SAN ONOFRE NUCLEAR GENERATING STATION UNIT NO. 2, DOCKET NO. 50-361 (Continued)

5. It is noted that prior to the beginning of the test, Train A air-start motors were in service, and the diesel generator would, therefore, have started if required.

Diesel generator 2G002 was unavailable during the test for one hour and fifty-four minutes (1009 to 1203) on June 21, 1983.

6. This current test interval is 14 days, in accordance with Table 4.8-1 of the Technical Specifications.

7. This test interval is in conformance with the schedule of Regulatory Position C.2.d of Regulatory Guide 1.108.

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ATTACHMENT II TO LER 83-071 SOUTHERN CALIFORNIA EDISON COMPANY SAN ONCPRE NUCLEAR GENERATING STATION UNIT NO. 2, DOCKET NO. 50-361 SUPPLEMENTAL INFORMATION FOR CAUSE DESCRIPTION AND CORRECTIVE ACTIONS It is considered most likely that MUO82 was inadvertently closed during the lineup to conduct the surveillance test on June 21.

At that time, similar valves in Train A were deliberately closed. All air start system valves were verified to be open after the performance of the last surveillance test on June 9, 1983. This verification consisted of an initial system alignment followed by an independent second lineup verification per SO23-3-3.23. A review of the Equipment Control work history files revealed that no work had been performeel on 2G002 from June 9 to June 21, 1983. After opening MUO82, 2G002 was successfully started at 1203 using the Train A air start system

_ only. 2G002 was declared operable in accordance with Procedure SO23-3-3.23 at 1340 on June 21, 1983. The required boration flow path was established at 1052 on June 21, 1983, by aligning Charging Pump 2P191 to Train B Diesel Generator 2G003 and restoring its DC control power.

As there is also the possibility of an unauthorized manipulation of MUO82 between June 9 and June 21, 1983, the seriousness of unauthorized valve manipulations has been re-emphasized to operating personnel. Also, Special Order 83-39, which responds to IE Bulletin 83-27 and details action to be taken when misalignment of a system is discovered, was implemented. No other misalignments were noted.

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V W E:p g Nu Southern California Edison Compqny a ,y, ,

WI S AN ONOFRE NUCLE A rt GENER A TING S T A TION d l} ,ff P.O. B ox 128 of S AN C LEMENTE. C ALIF ORNI A 92672 S TA TION M AN AQg n *% 4714) 492 7700 July 21,1983 i

U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention: Mr. J.B. Martin, Regional Administrator

Subject:

Docket No. 50-361 30-Day Report Licensee Event Report No.83-071 San Onofre Nuclear Generating Station, Unit 2 Pursuant to Sections 6.9.1.13.b and 6.9.2 of Appendix A, Technical i Specifications to Facility Operating License NPP-10 for San Onofre Unit 2, this submittal provides the required 30-day written report and a copy of the Licensee Event Report (LER) form for an occurrence involving Limiting Condition for Operation (LCO) 3.1.2.1 associated with the Reactivity Control Systems. Additionally, this submittal includes the information required by Surveillance i Requirement 4.8.1.1.3 for a diesel generator failure as determined i by Regulatory Position C.2.e of Regulatory Guide 1.108.

If there are any questions regarding the above, please contact me.

) Sincerely, 8 v i

Enclosure:

LER No.83-071 I

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Mr. J.B. Martin July 21, 1983 cc: A.E. Chaffee (USNRC Resident Inspector, Units 2 and 3)

J.P. Stewart (USNRC Resident Inspector, Unita 2 and 3)

U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Division of Technical Information and Document Control Institute of Nuclear Power Operations (INPO) 4 4

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