AECM-84-0063, Final Part 21 Rept PRD 83/08 Re Inability to Maintain Pressurized Water Supply to RHR Pumps & Discharge Piping Supplied by Bechtel.Initially Reported on 830415.Hardware Mods Implemented

Final Part 21 Rept PRD 83/08 Re Inability to Maintain Pressurized Water Supply to RHR Pumps & Discharge Piping Supplied by Bechtel.Initially Reported on 830415.Hardware Mods Implemented

ML20081B655
Person / Time
Site:	Grand Gulf
Issue date:	03/02/1984
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-84-204-000 AECM-84-0063, AECM-84-63, PT21-84-204, PT21-84-204-000, NUDOCS 8403090265
Download: ML20081B655 (4)

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MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. B O X 16 4 0. J AC K S O N, MIS SIS SIP PI 3 9 2 05

'3 A S , ,5 p Ma'rch 2, 1984 J AMES P. McGAUCHY, JR.

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

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

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417 License No. NPF-13 File 0260/15525/15526/16694.4 PRD-83/08, Final Report RHR Jockey Pumps AECM-84/0063

Reference:

AECM-83/0243, 4/15/83 AECM-83/0326, 6/13/83 On April 15, 1983, Mississippi Power & Light Company notified Ms. L.

Watson, of your of fice, of a Reportable Deficiency at the Gr .ad Gulf Nuclear Station (CGNS) . The deficiency concerns the inability to maintain a pressurized water supply to the RHR Pumps and discharge piping.

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

Details are provided in our attached Final Report, which was originally due on February 1,1984, but an extension until March 2,1984, was granted by Mr. Paul Fredrickson.

Yours t ruly, p g J. P. McGaugby, Jr.

RDC/KDS:dr ATTACHMENT cc: See page 2 7 7.% D 8403090265 840302 2 DR ADOCK 05000416

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Member Middle South Utilitieri System {

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l Mr. J.'P. O'Reilly AECM-84/0063 l NRC Page 2  ;

cc: Mr. J. B. Richard Mr. R. B. McGehee

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Mr.-T. B. Conner Mr.-Richard C, DeYoung, Directer Of fice of Inspection & Enforcement ;

U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. C.' B., Taylor . .

South Miss. Electric Power Issociation P. O. Box 1589 Hattiesburg, MS 39401 5

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Attachment to AECM-84/0063 Page 1 of 3 ,

I FINAL REPORT FOR PRD-83/08

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

1 J. P. McGaughy, Jr.

Vice-President - Nuclear P.O. Box 1640

~ Jackson, Mississippi 39205 Identification of the f acility ... which . . . contains a deficiency:

2 .' l Grand Gulf Nuclear Station (GGNS) Unit 1 Port Gibson,' Mississippi 39150 This-deficiency is als'o reportable under 10CFR50.55(e) for Unit 2. It is not reportable under 10CFR21.for Unit 2 since the affected equipment has not been received b'y MP&L.

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

.contains a deficiency:

Supplied by the Bechtel Power Corporation,' Gait' ersburg, Maryland.

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

A. Description of the Deficiency The. deficiency concerns 'the f ailure of the A/E to provide a pressurized water' supply that would ensure that the Residual Heal Removal (RHR) pumps', A and B, and discharge piping are filled continuously with water as' required by the C. E. design specification.

The purpose of the pressurized water supply is to avoid delays in fill-

'ing the RM pump discharge piping and to avoid water hanmer ef fects during RL:( pump starts.

The RHR jockey- pump subsystems, designed by the A/E, were to provide the necessary pressurized water supply to the RHR pump and discharge piping.

Howe.ver, the jockey pump logic design caused the jockey pump to trip

- when it was required for_ RHR system pressurization.

~ The ~ jockey pump logic' was designed so that either the jockey pump min-flow valve or the Feedwater Leakage' Control (FWLC) system supply valve must;be open to allow jockey pump operation. - .With both the min-flow.

valve and the' FWLC supply valve cicsed the jockey pump would trip, removing the pressurized source of water from the RHR pumps and dis-charge piping. MP&L has determined that this design feature was incorporated ,to prevent dead-head' operation of the jockey pump.

.However, this violated the G. E criteria since there would be no aasurance that the RHR discharge line would remain in a filled condition without 'a' jockey pump running. -

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.i Attachment to AECM-84/0063 Pcgs 2 of 3 l

B.- Analysis of Safety Implications During normal operations t'he jockey pumps supply to the FWLC system is closed and the jockey pumps min-flow valves are open. This allows the jockey pump to supply press'urized water to the RHR pumps and discharge

_ piping. A containment isolation signal (high drywell pressure of RPV Level 2) will close the jockey pump min-flow valve, stopping the jockey pumps.

'During a LOCA, as Reactor Pressure Vessel (RPV) water level is

' decreasing, the jockey pumps will trip at a RPV Level 2. However, the RHR pumps would not automatically start until RPV water level reached Level 1. During this period of time the RHR discharge piping could become depressurized and partially drained. This would create a water hasser, during the RHR pump start,. which could result in damage to the RHR piping, valves, and piping supports.

MP&L has determined that this deficiency could create a substantial safety hazard.

.5.- ' The date on which the infi rmation of such deficiency . .. was obt'ained.

Mississippi Power and Light' received information of the deficiency on March 15, 1983. We reported the deficiency to Ms. L. Watson, of your office, as being reportable ' unde'r the provisions of.10CFR21 for Unit 1 on April'15, L1983. An evaluation for Part 21 has been completed and the MP&L " Responsible

';,4 l Officer," Mr. J. P. McCaughy, Jr. , has been notified.

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

The design deficiency of the' RH1 jockey pump logic is located at Grand C,21f

. . Nuclear Station,= Unit s 1,and 2. .Our A/E has issued QAR-F-395 to provide a

< tracking mechanism for Unit 2 and has initiated action to incorporate the Unit

~1" design modifications, as appropriate. This . is a plant specific design and

'1we have 'no knowledge of such deficiencies ~ other than at GGNS. .

'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 MP&L has completed ~ hardware modifications per 's Design Change Package

(DCP-83/5006) to correct the subject deficiency. on Unit 1. This-

. modification.will prevent the automatic tripping .of the jockey pump due y  : to the valve closures. In addition to the removal of the pump trip, the automatic containment isolation: signal was removed from the valve, in the min-flow line to- prevent pump dead-heading. To provide containment

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Attachaant to AECM-84/0063

, Page 3 of 3

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isolation, the valve in the min-flow line will automatically isolate any time the jockey pump is not running. The LOCA automatic containment isolation signal is not needed because this is a nuclear safety-related system and the jockey pump discharge pressure is higher than the containment design pressure.

DCP 83/5006 hardware changes were completed prior to nuclear heatup.

This design change was reviewed by the NRC as it required a GCNS

. Technical Specification change.

The A/E hse initiated actions to incorporate the Unit 1 modifications, as appropriate, on Unit 2. This action will be tracked on QAR-F-395 for

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,) Unit 2.

B. Responsible Individual Unit'1' Unit 2 J. E. Cross T. H. Cloninger.

Plant Manager ^

Unit 2 Project Manager Mississippi Power & Light Co. Mississippi Power & Light Co.

, C. Lenath of Time to Complete Actions

. Hardware ch'anges for Unit 1 were completed prior to nuclear plant heatup per DCP-83/5006.~ The necessary changes for Unit 2 will be completed prior to Unit 2 fuel load.

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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