ML20057B262
| ML20057B262 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 09/13/1993 |
| From: | Hutchinson C ENTERGY OPERATIONS, INC. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 93-003, 93-3, GNRO-93-00115, GNRO-93-115, NUDOCS 9309210085 | |
| Download: ML20057B262 (2) | |
Text
a WM Entergy operations,Inc.
cz'ENTERGY ec eox 75e Ftet Gbson. PAS 39150 id 601437 2800 C. R. Hutchinson v.e w. ant September 13, 1993 4
e o m.a tuu sw U.S. Nuclear Regulatory Commission Mail Station P1-137 Washington, D.C.
20555 Attention:
Document Control Desk
Subject:
Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-29 Special Report 93-003 Invalid Failure of Emergency Diesel Generator 12 Due to Leaking Jacket Water Coupling GNRO-93/00115 Gentlemen:
On August 12, 1993 following an outage of Standby Diesel Generator (SDG) 12, a functional test was being performed to demonstrate system operability. SDG 12 was started in accordance with plant surveillance procedure 06-OP-1P75-M-0002 and reached rated speed and voltage. SDG 12 was loaded to approximately 5.6 Megawatts for 0.57 hours6.597222e-4 days <br />0.0158 hours <br />9.424603e-5 weeks <br />2.16885e-5 months <br />.
Prior'to completing the run, personnel stationed at the SDG observed a jacket water leak coming from the number 4 right bank I
cylinder Dresser coupling. In an attempt to stop the leak, maintenance personnel tighten the coupling. The leak stopped momentarily. The test was terminated to repair the leak.
Maintenance personnel determined that the coupling nuts were not tight and the coupling was not square on the jacket water piping.
Personnel replaced the coupling gaskets and the coupling was satisfactorily checked for leaks. The SDG was successfully tested following the corrective maintenance.
During the surveillance test in which the leak was observed, engineering personnel and the operations shift supervision examined the leak and determine that the test could be completed.
However, the decision was made to shut SDG 12 down to correct the leak.
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. September 13, 1993 GNRO-93/00115 Page 2 of 3 i
S DG 12 was loaded to at least 50 percent, but it did not run for one hour during the initial test. Therefore, this occurrence is considered an invalid failure. This report is being submitted pursuant to GGNS Technical Specification Surveillance Requirement 4.8.1.1.3.
Yours truly, CRH/RR/
cc:
Mr.
R.
H.
Bernhard Mr.
H.
W.
Keiser Mr.
R.
B.
McGehee Mr.
N.
S.
Reynolds Mr.
H.
L.
Thomas Mr. Stewart D.
Ebneter Regional Administrator U.S.
Nuclear Regulatory Commission Region II 101 Marietta St.,
N.W.,
Suite 2900 Atlanta, Georgia 30323 Mr.
P.
W. O'Connor (w/2)
)
Office of Nuclear Reactor Regulation 1
U.S.
Nuclear Regulatory Commission Mail Stop 13H3 Washington, D.C.
20555 l
.