AECM-83-0609, Final & Interim Deficiency Rept for Units 1 & 2,respectively Re Incorrect Operation of Div I & II Diesel Generator Load Shedding & Sequencing Sys Panels W/Automatic Test Feature on Line.Initially Reported 830921.Also Reportable Per Part

Final & Interim Deficiency Rept for Units 1 & 2,respectively Re Incorrect Operation of Div I & II Diesel Generator Load Shedding & Sequencing Sys Panels W/Automatic Test Feature on Line.Initially Reported 830921.Also Reportable Per Part 21

ML20080L890
Person / Time
Site:	Grand Gulf
Issue date:	09/21/1983
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-83 10CFR-050.55E, 10CFR-50.55E, AECM-83-0609, AECM-83-609, NUDOCS 8310030373
Download: ML20080L890 (4)

Text

. -= s MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. BOX 1 40 JACKSON, MISSISSIPPI 39205 g

Q SEP 5A -

JAMES P. McGAUGHY. JR.

September 21, 1983 WICE PRE SIDENT Of fice of Inspection & Enforcement U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, N.W.

Suite 2900 Atlanta, Georgia 30303 At ten tion: Mr. J. P. O'Reilly , Regional Administrator

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket No. 50-416/417 License No. NPF-13 File 0260/15525/15526/16694.4 PRD-83/13, Final Report for Unit 1; Interim Report for Unit 2, Load Shedding and Sequencing System Panels AECM-83/0609 On September 21, 1983, Mississippi Power & Light Company notified Ms. L.

Watson, of your office, of a Reportable Deficiency at the Grand Gulf Nuclear Station (GGNS). The deficiency concerns the incorrect operation of the Division I and II diesel generator load shedding and sequencing system panels with the automatic test feature on-line.

MP&L has determined that this deficiency is reportable under the provisions of 10CFR21 for Unit 1 and potentially reportable under the provisions of 10CFR50.55(e) for Unit 2.

Yours truly,

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['O.P.McGaughy,Jr.

ATTACHMENT cc: See page 2 3320030373 830921 o. u 1/[' rh bA PDR ADOCK 05000416 S PDR f6 A Member Middle South Utilities System \\

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4 Mr. J. P. O'Reilly ABCM-83/0609 ,

NRC Page 2 -

cc: Mr. J. B. Richard

.Mr. R. B. McGehee Mr. T. B. Conner I

Mr. Richard C. DeYoung, Director , j!'l Of fice of Inspection & Enforcement .

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U. S. Nuclear Regulatory Commission /

Washington, D.C. 20555 ,

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Mr. G. B. Taylor South Miss. Electric Power Association P. 0. Box 1589 /

Hattiesburg, MS 39401 s

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Attachment to 'AECM-83/0609

.; Page 1 of 2

, ' xg FINAL REPORT FOR UNIT 1, INTERIM REPORT FOR UNIT 2 '

1. Name and address of the individual . .. informing the commission:

J. P. McGaughy, Jr.

Vice-President , Nuclear P.O. Box 1640 -

Jackson, Mississippi 39205 Notification of Part 21 Applicability m' ade tb Mr. J. F. O'Reilly, NRC, i Region II by letter AMCM-83/0609, . September 21',' 1983.

This deficiency was also reported under 10CFR21 by Vitro Laboratorf er to the NRC in their letter dated August 19, 1933.

2. Identification of the facility . .. which . . . contains a deficiency:-

f Grand Gulf Nuclear Station .(GGNS) Units 1 and 2 Port Gibson, Mississippi 39150

! 10CFR21 is not applicable for Unit 2 as the Load Shedding and Sequencing panels -have not been turned over to MP&L; 3

3. Identification of the firm .. . supplying the basic component which .. .

contains a deficiency:

The Load Shedding and Sequencing' panels were manufactured by Vitro t' Laboratories and supplied to Grand Calf by Bechtel Power Corpora-i tion, Gaithersburg, Maryland.

4. . Nature of the deficiency ... and the safety hazard which ... could be created by such a deficiency ...:

A. Description of the Deficiency 4

During the performance of the 18 month surveillance testing of the diesel generators, it was discovered that the Division I and II

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-Load Shed and Sequence System (LSSS) Panels, lH22-P331 and P332, do not always respond as designed to a LOCA signsl while the panels are in the Auto Test Mode. The LSSS Auto Test Mode, which is on-line for normal system operation, inputs high frequency

signals and decodes output signals 'to determine if the panel logic

is capable of functioning. The deficiency involves a situation where the high frequency auto test signal does not get blocked upon receipt of a LOCA signal, and the LSSS panel responds to the accident at a speed determined by the high frequency clock. Thus the shed and sequence output relays do nat'have time to energize.

- This incorrect operation only occurs whea the LOCA signal is input

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to the system coincident and synchronous with the test pulse and does not. occur on the receipt of a loss of power signal or when the Auto Test Mode is off.

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B. Analysis of Safety Implications Division I and II ECCS Pumps would not be sequenced back on the ESF buss and therefore would not auto-start, if required.

Other loads would not shed or sequence at the right time.

5. The date on which the information of such deficiency . .. was obtained.

Mississippi Power & Light received information of the deficiency on July 23, 1983. We reported the deficiency to Ms. L. Watson, of your office, as a Reportable Deficiency for Unit 1 on September 21, 1983. An evaluation for Part 21 has been completed for Unit 1 and the MP&L

" Responsible Of ficer," Mr. J. P. McGaughy, Jr. , will be notified when he returns to his of fice.

6. In the case of the basic component . . . the number and location of all such components.

There are two (2) LSSS panels on each Uatt at Grand Gulf for a total of four (4). We do not have knowledge of the location of other defective e qui pmen t.

7. The corrective action which has been taken . . . the name of the individual .. . responsible for the action; and the length of time that has been . . . taken to complete the action.

A. Corrective Actions Taken A design modification was provided and installed by Vitro under DCP-83/0398 as a field change to the Unit 1 LSSS panels. Retests of the panels were satisfactory.

For Unit 2, our Architect / Engineer has issued QAR F-411 to track this deficiency.

B. Responsible Individual C. K. McCoy T. H. Clontager Plant Manager Unit 2 Project Manager Mississippi Power & Light Co. Mississippi Power & Light Co.

Responsible for Unit 1 ReJponsible for Unit 2 C. Length of Time to Complete Actions Corrective actions for Unit 1 are complete. A projected comple-tion date for Unit 2 is not available at this time due to the limited ongoing construction ef fort; however, we expect to submit our next Interim Report by March 1,1984.

8. Any advice related to the deficiency . . . that has been, is being, or will be given to purchasers or licensees:

As the deficiency did not originate with MP&L, we have no advice to offer.

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