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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P NOV 0 41974 I

w Dochet No, 50-29

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p Yankee Atomic Electric Company i

ATDI:

Mr. Carl Andognini, Assistant to the Vice President

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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.

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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

a-p; 2-Yankee Atomic Ilectric Company'

% 0 4 1974 i

cc w/ enclosure:

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

Yankee' Atomic Electric Cocipany 20 Turnpike Road L'ostboro, Massachusetts 01581 t

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a ADDITIONAL' INTOR'!ATION FIOUIRED TROM ALL UTILITIES R

. 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.

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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 lE..

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-s r

plant operation.

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Containment Spray Water Temperature - Show that tile value of b

containment spray water tc=per ture used in the containnent g

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response analysis is the lower bound te=perature consistent

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with plant operating conditions.

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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p b) Mass and energy release rates to the containment as a function E

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of time during the blowdown, refill and reflooding periods of 1

the accident.

Ine_lude any spilled ECCS vater.

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