AECM-85-0045, Final Part 21 & Deficiency Rept Re Possible Failure of Polycarbonate Bowls on Air Filters for Tdi Engine Control Panels.Initially Reported on 850213.Polycarbonate Bowls Replaced W/Metal Bowls

Final Part 21 & Deficiency Rept Re Possible Failure of Polycarbonate Bowls on Air Filters for Tdi Engine Control Panels.Initially Reported on 850213.Polycarbonate Bowls Replaced W/Metal Bowls

ML20111B268
Person / Time
Site:	Grand Gulf
Issue date:	02/18/1985
From:	Dale L MISSISSIPPI POWER & LIGHT CO.
To:	Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-85, REF-PT21-85-128-000 AECM-85-0045, AECM-85-45, PT21-85-128, PT21-85-128-000, NUDOCS 8503130048
Download: ML20111B268 (1)

Text

r i .

MISSISSIPPI POWER & LIGHT COMPANY

] Helping Build Mississippi Ml P. O. B OX 164 0, J AC K S O N, MIS SIS SIP PI 3 9 205 e 22 P l 'fc66ary 18,1985 NUCLEAR LICEN$1NG & SAFETY DEPAR U. S. Nuclear Regulatory Commission Region II 101 Marietta St., N.W., Suite 2900 Atlanta, Georgia 30323 Attention: Dr. J. Nelsen Grace, Regional A binistrator

SUBJECT:

Grand Gulf Nuclear Station Units 1 & 2 Docket Nos. 50-416 and 50-417 License No. NPF-29 File: 0260/0511/0512 Reportable Deficiency - 85/01, Air Filter Bowl Deficiency on Air Supply Line to Diesel Generator Engine Control Panele AECM-85/0045 On February 13, 1985, Mississippi Power & Light Company (MP&L) notified Mr. Vince Panciera of your office of a Reportable Deficiency at the Grand Gulf Nuclear Station (GGNS). The deficiency concerns the possible failure of a polycarbonate air filter bowl on the air supply lines to the Division I and II Diesel Generator Engine Control Panels.

This deficiency was determined to be reportable under the provisions of 10 CFR 21 for Unit I and 2 cnd 10 CFR 50.55 (e) for Unit 2. Attached is our final report on the subject.

Yours truly, 8503130048 850218 PDR ADOCK 05000416 L. F. Dale O

h Director EBS/SHH:vog Attachment cc: Mr. J. B. Richard (w/a)

Mr. R. B. McGehee (w/a)

Mr. N. S. Reynolds (w/a)

Mr. G. E. Taylor (w/o) l Mr. Richard C. DeYoung, Director (w/a) l Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 i

_UmCIAI copy. f Member Middle South Utilities System J0P13 MISC 85011202 - 1 p

n ,

^

L *- '

Attachment to AECM-85/0045

_ Page 1 10 CFR 21 REPORT l N

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

J..B. Richakd Senior Vice President, Nuclear P. 0. Box 1640 Jackson, Mississippi 39205

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

9 Grand Gulf Nuclear Station (GCNS) Unit'I and Unit 2-Port Gibson, Mississippi '39150 ,

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

. . . contains a deficiency:

Supplied to Grand Gulf by Transamerica Delaval Inc., Oakland, CA 4 .- Nature of the deficiency . . . and the safety hazard which . . . could be. created by such a deficiency . c. .: , ,

uA. Description of the Deficiency On January 29, 1985, MP&L-received TDI'q.10CFR21 notification dated January 22, 1965 to the'NRC.concerning the use of polycarbonate bowls on air filters for the engine control panel. Per TDI,.the .

polycarbonate bowl has been derated from 250 psig to 150 psig since the original issue of TDI's purchase specification for the air filters. On November 5, 1978 TDI's-purchase specification for the air filters was changed from using a polycarbonate bowl to the'use of a metal bowl. The polycarbonate bowl is now rated at 150 psig and the metal' howl is rated at 250fpsig.

It should be noted that the Unit 1 Division I and II diesel generators were supplied to GGNS in early 1977 which was prior to the November 1978 specification change by..TDI.

An inspection of the Unit 1 air filters on the air supply:line to-the control panel confirmed that-the polycarbonate bowls are utilized. The operating pressure of_the system where the bowls are located is approximately 240 psig.

In addition,-prior to TDI's notification, the!polycarbonate bowls have experienced 240 psig pressure with no. reported failures, i~.e.,

TDI shop tests,~GCNS startup tests and system operation.

The filter bowls.are considered redundant basic components as

~ defined in NUREG-0302. A simultaneous failure of'the bowls on the J Division I and'II D/G control panels ~is' considered to be;a highly

! unlikely event, based on'past operating experience. 1However, the Jbowls have been derated, therefore,'a defect in a basic component

~

j '

i~ exists as defined within.the guidelines of 10CFR21.

l j . .

. J0P13 MISC 85011202 ,

e

I ~

Attschnent to AECM-85/0045 Page 2 B. Analysis of Safety Implications A potential gross failure of these bowls could. deplete the air supply to the extent that the_ designed intent of the engines could be impaired, i.e., the starting air storage tank could be depleted to the extent of causing the air supply to drop below 160 psig. At this point, the design of the control system would lock out the LOCA start capabilities.

Should the air supply depletion continue, through the postulated failed bowl, the air pressure could deplete to the point that manual engine start capabilities could also be affected since air replenishment to the air storage tanks is limited to 76 scfm.

Loss of the Division I and II availability, is considered to be' a reduction in the degree of protection provided to public health and safety.

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

Mississippi Power & Light received information of the deficiency on January 29, 1985. ,

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

There is one polycarbonate bowl installed on each Unit I and 2 Division I and II Diesel Generator control air system for a total of four bowls at GGNS.

We do not have knowledge of the location of other defective equipment.

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 Unit 1 Material Nonconformance Report (MNCR)-0058-85 was issued to document the noted condition and was dispositioned to replace the polycarbo-nate bowls with metal bowls supplied by TDI.

Unit 2 Corrective actions to replace the polycarbonate bowls with metal bowls will be tracked by Bechtel Management Corrective Action Report (MCAR) 156.

B. Responsible Individual -

J. B. Richard Senior Vice President, Nuclear Mississippi Pcwer & Light Company J0P13 MISC 85011202 - 4

3 L i* Attcchm:nt to AECM-85/0045 Page 3 C. Length of Time to Complete Actions Unit 1

-Corrective actions for Division II was completed on February 12, 1985.

Corrective actions for Division I was completed on February 14, 1985.

Unit 2 A .iate for completion of corrective actions will be scheduled upon resumption of construction activities.

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.

4 A

e d

J0P13 MISC 85011202 - 5

, . . - . - ,