ML19095A264

04/14/1978 Response to Request for Additional Information Reliability Study of Standby Diesel Generator Units

ML19095A264
Person / Time
Site:	Surry
Issue date:	04/14/1978
From:	Stallings C Virginia Electric & Power Co (VEPCO)
To:	Case E Office of Nuclear Reactor Regulation
References
Download: ML19095A264 (2)

Text

.....

e Vreo1NIA ELECTRIC AND PowER CoMPANY RICHMOND, VIRGIN IA 23261 April 14, 1978,

• Mr. Edson G. Case, Acting Director Serial No. 614A/121577 Office of Nuclear Reactor Regulation PO&M/DLB:das U. S. Nuclear Regulatory Conunission Docket Nos. 50-280 Washington, D. C. 20555 50-281 License Nos. DPR-32 DPR-37

Dear Sir:

In response to your request of December 15,.1977, completed questionnaires on Standby Diesel Generators were forwarded in our letter of January 23, 1978.

Two completed questionnaires *were forwarded; one for Surry Unit Nos. 1 and 2 and one for North Anna Unit No. 1. In the questionnaire for Surry Unit Nos. 1 and 2, seven items were not filled in due to unavailability of data. The missing information has been obtained and is included in the attachment to this letter.

Ver';( t.ruly;/)/ours,

/~------- / / ' / J'p,/ 1 I

' /;,*/)(,

,/ / l ,,/ , j \... (

tr \_,/

./'//

/, ,r . / .I

/ .,/

1

. ./ / .' J .'  ;:,.,., : . l ~- .,. -- I .../ *,, I ' " -~- ',,/ ,/

_./. c~ M. Stallings /

Vice President - Power Supply and Production Operations c2>

Attachment ,.,

(*

~* .  ;

(;:.J *~-,*=

.

; :-..:: ~-*;

~4"0~....

-~Z~.::

~(..f)z.:.;

-,ri  :::0 0 C) rn CJ)

e e Attachment QUESTIONNAIRE FOR NUCLEAR REGULATORY co~~IISSION RELIABILITY STUDY OF STANDBY DIESEL GENERATOR UNITS SURRY POWER STATION UNIT NOS. 1 AND 2 The following information was not available at the time of our January 23, 1978 submittal. Item numbers used are from the original questionnaire.

Item B.2 (p2): "Minii.'Illilil air tank pressure for cranking: 90 psig ItemB.2 (p3): "What is air pressure drop from air tank to engine during cranking?" 28 psi 11 Item B.2 (p4): What is the time required to recharge one air tank?"

35 minutes from 50 psig to 210 psig.

NOTE: Where questionnair~! refers to air "tank" we have interpreted this to mean "bank". Each engine has two independent "banks" consisting of three "tanks" ..

Item D .4a (p7): "Normal operating (oil) pressure: 75 psi.

Item L.3.a (pl4): "Equilibrium (lube oil pressure): 75 psi.

Item 0.3.a.b (pl7): " ... maximum speed surge when starting;" 965. rpm.

NOTE: Frequency meter is not functional on starting and tachometer is not normally observed during start. The figure reported is the result of observation of one start.

Item Q.5 (p18): Inside switch gear hottest (Temperature): 85°F with ambient temperature 72.

NOTE: Switchgear, voltage regulator and exciter are in the same cabinet.