ML20148H175

Forwards Request for Addl Info Re Review of Westinghouse ECCS Evaluation Model.Info to Be Submitted by 741201

ML20148H175
Person / Time
Site:	Yankee Rowe
Issue date:	11/04/1974
From:	Purple R US ATOMIC ENERGY COMMISSION (AEC)
To:	Andognini G YANKEE ATOMIC ELECTRIC CO.
References
NUDOCS 8011170375
Download: ML20148H175 (4)

Text

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NOV 0 41974 w

Dochet No, 50-29 [p

Yankee Atomic Electric Company -

i ATDI: Mr. Carl Andognini, Assistant to the Vice President '~

20 Turnpike Road Westboro, FMseachusetts 01581 C

E Gentlemen:

As a result of our generic review of the Westinghouse ECCS Evaluation Model, we have identified information which must be provided on a  ;

case-by-case basis to enable us to complete our review of individual E plant compliance with the criteria set forth in paragraph 50.46(b), -

" Acceptance Criteria for Emergency Core Cooling System for Light- 7-Water Cooled huclear Power Reactors," of 10 CFR Part 50. The infor- iv

=ation required is identified in the enclosure to this letter. P p

In order to maintain our review schedule for the Yankee Rowe plant, ,

ve need information requested by December 1, 1974.

Picase contact us if you desire any discussion or clarification of t,ho information required.

Sincerely, Original si:nud by:

Robert A. Purple Robert A. Purple, Chief Operating Reactors Eranch #1  ;

Directorate of Licensing

Enclosure:

Request for Additional Information cc: See next page THIS DOCUMENT CONTAINS POOR QUAUTY PAGES go1pno 3I

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Yankee Atomic Ilectric Company' - 2-

% 0 4 1974 ,

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, cc w/ enclosure:

Mr. Donald C. ' Allen, Preside.nt --

Yankee' Atomic Electric Cocipany 20 Turnpike Road L'ostboro, Massachusetts 01581 ,

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ADDITIONAL' INTOR'!ATION FIOUIRED , l TROM ALL UTILITIES R I

. UTILIZING WESTINGHOUSE NUCLEAR STEA'4 SUPPLY SYSTD!S q

1. Provide justification for the following input parameters t. sed in the ECCS evaluation model: ,

1 a) Net Free Containment Volume - Justification should include '.l

.U the total gross internal containment volume and the internal structures and equipment and their volumes which are sub-

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'.: n tracted to obtain the net free containment volume. A

• discussion of the uncertainties should be provided. i.

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h b) Passive Heat Sinks - Discuss .

the method of determining the ..

--a passive containment heat sinks. Identify each heat sink by . !;

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category (i.e. , cabfc tray, equipment supports, floor N p

grating, crane vall, etc.) and provide surf ace arca, thickness, Ik materials of construction, thermal conductivity and volumetric heat capacity, by component category used in the containment  !

transient analysis code.

c) Startinr, Time of Contcinment Cooldne Svstem(s) - Discuss the factors thct show that the start time (r) assumed in the con-tcinment response analysis represent the earliest possibic initiation of system (s) operation.

d) Containment Initial Conditions - Compare the initial values of te=perature, pressure and relative humidity in the con-tainment with the range of values that vill be permitted durin-  :

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plant operation. ')

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Containment Spray Water Temperature - Show that tile value of

• e) containment spray water tc=per ture used in the containnent g b

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response analysis is the lower bound te=perature consistent

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with plant operating conditions. ....

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2., For the most severe break provide the following information: ,

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. a) Fan-cooler heat removal rate as a funhion of containment .

1 atmosphere temperature. Show that minimum operational values ,

of service water temperature have been used in deter =ining the .

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. fan-cooler heat removal rate. }"

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b) Mass and energy release rates to the containment as a function E I.':

of time during the blowdown, refill and reflooding periods of  ;.

1 the accident. Ine_lude any spilled ECCS vater.  :.. >

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