ML18093B058

Special Rept 88-4:on 880808,diesel Generator 2A Failed to Achieve Rated Output.Caused by Equipment Malfunction. Defective Governor Replaced & Surveillance Procedure 4.8.1.1.2 Successfully Performed

ML18093B058
Person / Time
Site:	Salem
Issue date:	08/31/1988
From:	MILLER L K Public Service Enterprise Group
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
88-4, NUDOCS 8809140112
Download: ML18093B058 (3)

Text

• Public Service Electric and Gas Company P 0. Box E Hancocks Bridge, New Jersey 08038 Salem Generating Station U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555

Dear Sir:

SALEM GENERATING STATION LICENSE NO. DPR-75 DOCKET NO. 50-311 UNIT NO. 2 SPECIAL REPORT 88-4 August 31, 1988 This Special Report addresses the circumstances surrounding the No. 2A Diesel Generator valid failure occurring on August 8, 1988. This report is being submitted pursuant to the requirements of Technical Specification Surveillance 4.8.1.1.4.

MJP:pc Distribution 8809140112 880831 PDR ADOCK 05000311 S PNU The Energy People Sincerely yours, L. K. Miller General Salem Operations 95-2'8911:

M1 :2-3C:

\ , .. UNIT 2 SPECIAL PLANT IDENTIFICATION:

Salem Generating Station -Unit 2 Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

• • 2A Diesel Generator

-Failure to Achieve Rated Output Event Date(s): 8/08/88 Report Date: 8/31/88 This report was initiated by Incident Report No.88-312 CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 -Reactor Power 88% -Unit Load 970 MWe DESCRIPTION OF OCCURRENCE:

This special report describes a valid test failure involving 2A Diesel Generator (D/G} occurring on August 8, 1988. This report is submitted for informational purposes in accordance with Technical Specification Surveillance Requirement 4.8.1.1.4 and contains the information by Regulatory Guide 1.108, Revision 1, August-1977, Regulatory Position C.3.b. Surveillance Requirement 4.8.1.1.4 states: All diesel generator failures, valid or non-valid, shall be reported to the Commission pursuant to Specification 6.9.1. On August 8, 1988, a post maintenance surveillance test of 2A D/G was performed in accordance with Surveillance Procedure SP(O} 4.8.1.1.2., "Electrical Power Systems -Emergency Diesels".

The D/G did not accept load to the Technical Specification Surveillance 4.8.1.1.2.a.3 requirement of 2600 KW in 60 seconds. The D/G had readily loaded to 2500 KW, but was sluggish in attaining the required 2600 KW (total time was greater than 60 seconds).

Therefore, the D/G remained inoperable and Technical Specification 3.8.1.1.b Action Statement "a" could not be exited. APPARENT CAUSE OF eccURRENCE:

The cause of this D/G valid test failure was an equipment malfunction.

Troubleshooting revealed the Woodward Governor did not allow timely load control. The setting of the mechanical portion of the governor inhibited the D/G load from increasing to 2600 KW within 60 seconds. Adjustment of the mechanical governor to meet all acceptance criteria could not be attained.

ANALYSIS OF OCCURRENCE:

The failure of the governor to allow full loading of the D/G constitutes a valid test failure as described in Regulatory Guide 1.108. This was the second DIG failure in the last 100 starts for

... UNIT 2 SPECIAL REP01988-4

• ANALYSIS OF OCCURRENCE: (cont'd) all three (3) D/G's. With one diesel inoperable, the remaining diesels are capable of providing power to the minimum safeguards equipment required for analyzed accident and transient conditions.

Therefore, this event did not impact the health and safety of the general public. CORRECTIVE ACTION: The defective governor was replaced and Surveillance Procedure SP(0)4.8.1.1.2 was successfully performed.

The surveillance test interval was decreased to every fourteen (14) days in compliance with Regulatory Position C.2.d of Regulatory Guide 1.1.0.8. The defective governor is in the process of being shipped to the manufacturer for inspection and refurbishment.

MJP:pc SORC Mtg.88-071 ;/(;CiA General Manager Salem Operations