ML19339C615

Second Interim Deficiency Rept Re Standby Diesel Generator Jacket Water Cooler Thermostatic Valve Fracture.Cause Not Stated.Magnetic Particle Exam Performed on Remaining Valve. Final Rept Will Be Submitted by 810205

ML19339C615
Person / Time
Site:	Grand Gulf
Issue date:	11/10/1980
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, AECM-80-281, NUDOCS 8011180686
Download: ML19339C615 (2)

Text

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MISSISSIPPI POWER & LIGHT COMPANY

] Helping Build Mississippi ^'

EdhklMmeW P. O. B O X 18 40. J AC K S O N, MIS SIS SIP PI 3 9 2 0 5 l

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"UEN.Tce$d" November 10, 1980 Office of Inspection & Enforcement _-

U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, N.W.

Suite 3100 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Director

SUBJECT:

Grand Gulf Nuclear' Station Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 PRD-80/35, Interim Report (12 ,

Standby Dietal Generator Jacket Water Cooler Thermostatic Valve Fracture AECM-80/2J1

Reference:

AECM-80/166, 7/23/80 On June 26, 1980, Mississippi Power & Light notified Mr. M.

Hunt of your office of a Potentially Reportable Deficiency (PRD) concerning the Standby Diesel Generator. The deficiency was a fractured valve body on the Jacket Water Thermostatic Valve.

We have determined this deficiency to be reportable within the meaning of 10CFR50.55(e). The condition is not reportable under 10CFR21 because the components have r.ot been offered to MP&L for acceptance. Attached is our interim report.

We expect to submit a final report by January 29, 1981.

Yours truly, J. P. McGaughy, Jr.

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ATR:mt Attachment

]g ec: Mr. N. L. Stampley Mr. Victor Stello, Director  ;

Mr. R. B. McGehee , Division of Inspection & Enforcement Mr. T. B. Conner U. S. Nucin c Regulatory Cocsission Washington, D.C. 20555 g () } '] ~j p O N G Member

• Middle South Utilities System

. Attcchment to AECH-80/281 Page 1 of 1 INTERIM REPORT FOR PRD-80/35 I. Description of Deficiency During pneumatic pressure testing of the Unit 1 "B" Standby Diesel Generator, the jacket water thermostatic centrol valve cracked at the flange connection with adjacent piping. The -

pressure at the moment of failure was less than the valve design pressure.

It has been determined that failure of the valve could have led to a loss of coolant water which could have resulted in the failure of the Standby Diesel Generator. The failure of the Diesel Generator could have adversely affected the safety of plant operations, since its failure could degrade the safety related functions of the ESF 4.16 kv busses when off-site power is not available.

II. Corrective Action Taken and Results Achieved The remaining '* nit i valve, on the "A" Standby Diesel Genera-tor, was subjected to magnetic particle examination. The valve was found to have a hairline linear indication. It was deter-1 mined that the valve had been subjected to similar conditions as the Unit 1 "B" valve.

4 Both the vendor and the constructor are identifying causes and corrective actions to preclude recurrence, as applicable, to their organizations.

III. Reason for Delaying Final Report .

Corrective actions to preclude recurrence have not been completed.

IV. Projected Final Report Date A final report is expected to be submitted by February 5, 1981.

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