ML20077M669
| ML20077M669 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 08/26/1983 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 2NRC-3-068, 2NRC-3-68, 83-06, 83-6, NUDOCS 8309120396 | |
| Download: ML20077M669 (4) | |
Text
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"F T 2NRC-3-068 ap (412)787 - 5141 Telecopy 4
-6 Nuclear Construction Division Robinson Plaza, Building 2 Suite 210 August 26, 1983 Pittsburgh, PA 15205 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 ATTENTION:
Dr. Thomas E. Murley Administrator
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 Westinghouse NLP and NTC Cards Significant Deficiency Report No. 83-06, Final Report Gentlemen:
This Final Repo rt in reference to the pot ent ial misope rat ion of Westinghouse's loop power supply (NLP) cards and Temperature Channel Test (NTC) cards as repo rt ed to the Nuc le ar Regula to ry Commis sion by S.
D.
Hall of Duquesne Light Company on June 16, 1983.
An evaluation of these two cards has de t ermined that the NLP cards are not pres ent in BVPS-2, wh ile the NTC cards will be replaced.
Purs uant to the req uirement s of 10CER 5 0.5 5( e),
it is ant icipated that no additional reports on this matter will be issued.
DUQUESNE LIGHT COMPANY
~
r By b
l E. J. Woolever Vice President l
l JS/wjs At tachment j
ec:
Mr. R. DeYoung, Director Of fice of Inspection and Enforcement (3) (w/ attachment)
Mr. G. Walton, NRC Resident Inspector (w/ attachment)
Ms. L. Lazo, Project Manager (w/ attachment)
NRC Document Control Desk (w/ attachment) l INPO Records Center (w/ attachment) l SUBSCRIBED AND yWORN TO BEFORE ME THIS g #l DAY OF (d g,, J/
, 19 83.
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Not ary Pub lic ELVA G. LESONDAK, NOTARY PUBLIC 1
RCBINSON TOWNSHIP, ALLEGHENY COUN MY COMMISSION EXPIRES OCT g{)
8309120396 030026 gDRADOCK05000
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United States Nuclear Regulatory Commission Dr. Thomas E. Murley Page 2 COMMONWEALTH OF PENNSYLVANIA )
) SS:
COUNTY OF ALLEGHENY
)
On this O d day of
,,, m, 7', / M before me, a Notary Public in and for said Commonwealth p'd County, personally appeared R. J.
Washabaugh, who being duly sworn deposed and said that (1) he is duly authorized to execute and file the foregoing Submittal on behalf of E. J.
Woolever, Vice President of Duquesne Light, (2) he is duly authorized to execute and file the foregoing Submittal on behalf of said Company, and (3) the statements set forth in the Submittal are true and correct to the best of his knowledge.
/
& - Aa Notary Publi'c ELVA G. LESONDAK, NOTARY PUBLIC ROBINSON TOWNSHIP, ALLEGHENY COUNTY MY COMMISSION EXPIRES OCTOBER 20,1986
.,t BEAVER VALLEY POWER STATION UNIT NO. 2 DUQUESNE LIGHT COMPANY Report on Potential Significant Deficiency No. 83-06
" Westinghouse NLP and NTC Cards"
' 1.
SUMMARY
Westinghouse has described two problems concerning their 7300 Proces s Protection System. The problems are with the loop power supply (NLP) cards and the Temperature Channel Test (NTC) ca rd s.
Since that t ime, Int erim 4
Report No. I was issued by Duquesne Light Company on July 19, 1983.
- 2. ~ IMMEDIATE ACTION TAKEN Mr. S.
D. Hall of Duquesne Light Company's Regulatory Affairs Depa rtment notified Mr. Harry Kister of the NRC Region I of fice on June 16, 1983, of the pot ent ial 10CFR50.5 5(e).
An engineering evaluation was conduct ed to determine the reportability status of these two cards.
3.
DESCRIPTION OF DEFICIENCY The firs t problem concerns the NLP cards which were shipped from Wes ting-house Industrial Electronics Division (W-IED) between August 1, 1980, and i
S ept embe r 1,
1982.
These ca rds were found to - have adhesive bond failure which could cause the heat sink plate to separate and fall of f of the
. printed circuit board.
The plate is a conductive metal and under certain circumstances could cause shorting of low level signals if it became wedged
[
between ' ca rds in a card fr ame.
The af fect ed print ed circuit boa rd s are:
5NLP Sub-level 18 and ab ove, and 6NLP Sub-level 18 and a,b ov e.
.The heat sinks of concern can be identified by an'Einspection of the printed circuit card for hex nuts visible on the top side of 'the assembly, i
The second problem deals with a contact bounce experienced during seismic i
i
' t es t ing - of the NTC ca rd s.. This int ermi t ant cont act bounce will result in signal saturation of the downstream RTD Amplifier (NRA) card in the T hot and T cold circuits of the Westinghouse 7300 Process Protect ion System.
This signal saturation could result in a po s sib le de lay of the ove rt empe ra-1.
ture - A T and overpower - A P trips for.BVPS-2.
.4.
ANALYSIS OF SAFETY IMPLICATIONS I'
As stated in Interim Report fl, the NLP cards were de t ermined not to be present in BVPS-2.
'The NTC circuit cards have been provided for safety-related BOP use unde r Purchase Order 2BV-723.
Their application involves temperature control of the diesel generator building and the emergency switchgear roon while also providing post-accident t empe rature indication for the reactor containnent sumps and the fuel _ pools.
It should be noted that the erratic operation of the NTC circuit ca rds is limited to the durat ion of the seismic eve nt.
i
' Wors t-case analysis shows that a temperature transient would result fr om a -
temporary loss of temperature control in both the diesel generator building I-
3 v
and the emergency switchgear room.
In either location, the maximum t emper-ature would not exceed any equipment qualification limits, which are set at 120*F.
In addition, since the NTC circuit cards operate properly af ter the seismic event, ope ra t ion of the pos t-accident indica to rs associated with the reactor containment sumps ami the fuel pools, would not be a problem.
Therefore, any ~ erratic operations of the NTC circuit cards during a design basis seismic event will not adve rsely af feet the safety ope rat ion of BVPS-2.
5.
CORRECTIVE ACTION TO REMEDY DEFICIENCIES No corrective action need to be taken by DLC for the NLP cards since they are not present in BVPS-2.
Since the NTC circuit cards do not funct ion as required by the speci fica t ion, BVPS-2 will require W-IED provide new cir-cuit cards which meet the performance requirements of the specification.
6.
ADDITIONAL REPORTS No additional reports are expected to be submitted concerning this issue.
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