ML20029C142

From kanterella
Jump to navigation Jump to search
Suppls 901210 Response to Generic Ltr 89-10,Suppl 3,which Provided Info on Results of Degraded Voltage Calculations for RCIC & RWCU Operated Valves.Revised Calculated Thrust Capabilities Listed
ML20029C142
Person / Time
Site: Perry FirstEnergy icon.png
Issue date: 03/18/1991
From: Lyster M
CENTERIOR ENERGY
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-89-10, PY-CEI-NRR-1332, NUDOCS 9103260262
Download: ML20029C142 (2)


Text

._

GNTE PERRY NUCLEAR POWER PLANT s ii M ore Michael D. Lyster N R ROA

[0[gjg 4 81 PERRY, OHIO 44001 VICE PRESIDENT . NUCLEAR (2 0) 259 3737 March 18, 1991 PY-CEI/NRR-1332 L U.S. Nuclear Regulatory Commission Decument Control Desk Washington, D. C. ;0$55 Perry Nuclear Power Plant Docket No. 50-440 Supplemental Rear.nse to Generic Letter 81-10 i Supplement 3 Centlement By letter PY-CEI/NRR-1271 L, dated 12/10/90 we provid W infirmation on the results of degraded voltage calculations for the subject RCIC and 8tWCU motor opere ed valves. Our design verification is now complete and the revised results are presented by this letter. The new values ate a result of using the more conservative bus voltage at the steady State LO'lA voltage for each valve. The revised calculated thrust capabilities are as follows:

CURRENT CALCULATED PREVIOUS CALCULATED CALCULATED .

VALVE TYPE CAPABILITIES CAPABILITIES JilRUST TO CLOSE Borg-Warner 10" 56,340 lbs. 64,023 lbs. 27,397 lbs.

(Inboard)

Borg-Warner'10" 41,714 lbs. 47,789 lbs. 27,397 lbs.

(Outboard) i Borg-Warner 6" 21,614 lbs. 29,687.lb:. 13,627 lbs.

(Inboard)

Borg-Warner 6" 20,149 lbs. 23,135 lbs. 13,827 lbs.

(Outboard)

-* Using manufacturer's recommendations Even though the new' numbers are less conservative, they still represent an overall conservative margin when compared to the INEL test results and our calculations. It should also be pointed out that the probability of a LOCA concurrent with a.95% grid voltage condition is very low.

9103260262 910310 PDR ADOCK 05000440 PDR

/

'P U1 ffdhng CD'*DONe$

,pF

. DewoN1 fiectnc INmrectog tc-cooro w (V s\ 0 J 2566..l$.

f . . .

USNRC March 18, 1991 PY-CEl/NRR-1332 L We continue to maintain the position that the results of our design basic review are based on the best data currently available and there ale no deficiencies in the subject RCIC and RWCU valves and therefore, no corrective action is deemed necessary.

If you have any questions, please feel free to call.

Sincerol '

il ,

  • w Michael D. Lys er MDL CJFinjc cc NRC Project Manager NRC Resident Office NRC Region 111 b

_m..__ -_- _ _ . _.__m. _ . _.___._ . _ _ _m___._- __.M______ - . _ _ _ . _ _ . _ _ . . _ - . - . _