ML17326A641

Forwards Responses to NRC 800227 Ltr Re Mods to Facility Auxiliary Feedwater Sys & Requests for Addl Info Concerning Util Response to NRC 791030 Ltr

ML17326A641
Person / Time
Site:	Cook
Issue date:	03/28/1980
From:	Maloney G INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	Harold Denton Office of Nuclear Reactor Regulation
References
NRC:00307A, NRC:307A, NUDOCS 8004080534
Download: ML17326A641 (8)

Text

REGULATORY I VFORMAT ION DISTR IBUT EON SYSTEM (RIOS)

ACCESSION Nf3R: 8004080530 DOC ~ OA TE: 80/03/28 NO I'AR I ZED: NO DOCKET FAG IL:'SO-315 Dona d C ~ Cook Nuc ear Power P 1 ant g Unit 1 i Indiana 1 1 8 50 316 Donald C, Cook Nuclear Power Pl anti Uni t 2~ 8, 05000'ndiana 031 AUTH DNA"1E AUTHOR AFF ILIATION

~ALONEYgG,P, Indiana 8 'lichiqan Electric Co ~

RECIP ~ NAME RECIPIENT AFFIL EAT EON DENTONpH ~ RE Uffice of Nuclear Reactor Regulation

SUBJECT:

Forwards resoonses to NHC 800227' t r re iiods to facility auxiliary f eeawat er sys 5 request for addi in f o concerning util resoonse to NRC T91030 ltd DISTHIBUTION CODE: A039S COPIES RECEIVED:LTH TITLE: Reso to Lesson'earn Task Force

/ ENCL / SIZE:

nest inghouse Mori:-s: T 5f-t

- 8 c.- f5 QC= As a ~~r~

RECIPIENT COPIES . RECIPIENT COPIES ID CODE/NAME LTTR ENCL IO CODE/@AWE LTTR ENCL ACTION 10 BC

~~~ ~ I INTERNAL: 01 1 1 02 NHC PDR 1 1 05 OLSHINSKEr J, 1 1 06 i<ERHIGANgJ ~ 1 1 07 BUROEONgJ ~ 1 1 08 &ELLESpC ~ 1 1

17. I 4 F 2 2 20 CORE PERF BH 1 1 21 ENG OR 1 1 22 REAC SFTY BR 1 1 23 PLA'vT SYS BR 1 1 2~ EEB 1 1

?5 EFLT TRT SYS 1 1 ANDERSONgN ~ 1 1 F IELDSg H. 1 1 0 RE ILLYg P ~ 1 1 UELO 1 0 TELFORDgJ AT ~ 2 2 EXTERNAL: 03 LPOH 1 1 00 NSIC 1 1 26 ACRS 16 16 TUTAL NU~BER OF COPIES RE.QUIREO: LTTR ~ ENCL

~ e'. ~ W INDIANA II MICHIGAN ELECTRIC COMPANY P. O. BOX 18 BO WL IN G G R E EN ST A T ION NEW YORK, N. Y. 10004 March 28, 1980 AEP:NRC:00307A D'onald C. Cook Nuclear Plant Unit Nos. 1 and 2 Docket Nos. 50-315 and 50-316 License Nos. DPR-58 and DPR-74 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Denton:

Attachment 1 to this letter responds to Mr. AD Schwencer's letter of February 27,1980 concerning the modifications we are making to the auxiliary feedwater system in Units 1 and 2 of the Donald C. Cook Nuclear Plant. Attachment 2 to this letter re-sponds to requests for information made by your Staff during recent telephone discussions concerning our responses to Mr. D.

Eisenhut's October 30, 1979 letter.

Very truly your ,

GPM:em . P. Mal ney Vice Pre iden Attachments cc: R. C. Callen G. Charnoff R. S. Hunter R. W. Jurgensen D. V. Shaller - Bridgman post 5

(li

ATTACHMENT 1 TO AEP'NRC'00307A uestion 1 Licensee Letter No. AEP:NRC:00307 dated December 7, 1979 indicates that the proposed ventilation system in both of the new safety-related battery rooms are designed to Seismic Category I and Group D Standard.

This is not acceptable to the Staff. It is our position that the above stated ventilati,on systems are required to meet Seismic Category I and guality Group C requirements . Confirm that these requirements will be met.

~Res onse:

The battery room ventilation system meets Seismic Class I requirements.

The fan meets AMCA Group C requirements as well as Group D.

uestion 2 The licensee has not provided information regarding the electric power supplies to the new battery room ventilation system. Confirm that the proposed redundant venti lation systems in each of the new battery rooms are powered from separate essential buses and provide the results of an analysis to demonstrate that the H2 concentration and the temperature inside the battery rooms will be maintained within allowable limits for at least two hours following loss of both offsite and onsite AC power.

~Res onse:

A. The redundant ventilation system for the battery rooms is supplied from separate essential buses. Fan lA is fed from the 600V Auxiliary Safety Bus 21D. Fan 18 is fed from the 600V Auxiliary Safety Bus 21A.

B. When both offsite and onsite AC power are unavailable, the battery charger will be de-energized. For the Cook Plant batteries, hydrogen and heat are produced only during battery 'charging. Thus, there will be no buildup of hydrogen or any temperature increase in the event of AC failure.

ATTACHMENT 2 TO AEP:NRC:00307A The following three questions were received from members of your Staff during a telephone conversation on March 12, 1980.

uestion 1 Provide a description of the procedure referenced in your submittal of December ll, 1979 (AEP:NRC:00300) in response to Recommendation GS-4.

~Res onse:

Procedure No. OHP-4022.055.003 entitled, "Loss of Condensate to Auxiliary Feedwater Pumps" has been developed in fulfillment of our commitment in response to Recommendation GS-4 of Mr. Eisenhut's October 30, 1979 letter (AEP:NRC:00300). The purpose of this procedure is to provide the operator with instructions for switching the auxiliary feedpump suction from the condensate storage tank to the alternate Es'sential Service Water Supply (ESW). This action will enable the operator to mai ntain steam generator water level in the event that the condensate storage tank level is depleted and to prevent pump damage due to loss of this water supply.

ESW can be supplied to all motor-driven auxiliary feedpumps and turbine-driven auxiliary feedpumps for both Units by opening the manual valve and the motor-operated valve in series in each alternate supply line.

Upon receipt of the condensate storage tank lo-lo level alarm, an operator is sent to the auxi liary feedpump rooms to align the essential service water valves to provide suction to each of the pumps. The telltale connection in-between the two ESW supply valves in series is unlocked and closed. The'anual ESW valve is then unlocked and opened. Subsequently, the control room is notified to,open the ESW motor-operated valve. This provides the required flow path to the pump suction and can be accomplished in less than ten minutes.

uestion 2 In your response to additional short-term recommendation 1 you indicate that the condensate storage tank has redundant sensors providing signals to a continuous recorder in the control room. Provide a commitment to install an additional recorder for condensate storage tank level for full redundancy as your response implies there is only a single recorder.

~Res onse:

The condensate storage tank level is monitored by redundant transmitters which transmit their signals to individual (a set per transmitter) low level alarms and high level alarms in the control room. A recorder is connected

to the transmitters by a selector switch which enables the operator to record level from either transmitter train. Once the operator receives the low-water level signal, he can check (by use of the selector switch) the redundant transmitter input of the recorder for confirmation of the signal. This design is in compliance with the intent of recommendation 1 since the alarm functions are served by their own transmitter (redundant).

Furthermore, we will be installing a low suction pressure trip of the auxiliary feedwater pumps as indicated in'our letter of December 11, 1979 (AEP:NRC:00300) in response,to recommendation GL-4. There is no need for an additional recorder as it will not provide the operator with any information which either. he doesn't already have or is in;, peed of to properly operate the AI:W'ystem.'uestion 3

In your response to additional short term recommendation 2, you list adequate run times for demonstrating sustained operation of the auxiliary feedwater pumps. Provide the test records and data requested. by recommendation 2 for these pump runs. If this information is not available for these runs, provide a commitment and schedule to perform the 48-hour pump endurance testing i n accordance with the criteria of recommendation 2.

~Res onse:

We have not recorded the type of data during past pump performance testing that you now request from us.'s such, we will perform the 48-hour pump endurance testing on one of the turbine-driven auxiliary feedwater pumps and on one of the motor-driven auxiliary feedwater pumps. This testing will be done just before we enter the upcoming Spring - 1980 refueling of Unit 1. We see no reason to test all the pumps since the Cook Plant motor-driven pumps are identical to each other and the turbine-driven pumps are, likewise identical. We will submit the test records and data that you require, for the above pump testing, within 60 days of performing the 'actual test.