ML20009E509

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Forwards Rept of Changes to Surry Simulator Model,As Result of Low Power Natural Circulation Test,Required by Suppl 11 to SER (NUREG-0053)
ML20009E509
Person / Time
Site: North Anna Dominion icon.png
Issue date: 07/23/1981
From: Leasburg R
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To: Clark R, Harold Denton
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0053, RTR-NUREG-53 450, NUDOCS 8107280263
Download: ML20009E509 (3)
v • d • e


Text

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VIRGINIA ELECTRIC AND POWER COMPANY f

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litenxoxn, V1MOINIA 20261

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July 23, 1981 s

11 H.H.Laammuno s

vice Pensionar Necs. nam Ormaatsome Mr. liarold R. Denton, Director Serial No. 450 Office of Nuclear Reactor Regulation N0/RMT:rhh Attn:

Mr. Robert A. Clark, Chief Docket No. 50-339 Operating Reactors Branch No. 3 License No. NPF-7 Division of Licensing U. S. Nuclear Regulatory Commission Washington, t).

C.

20555 Centlemen:

This letter is to provide the report of changes to the Surry Simulator model as a result of Low-Power Testing required by Section 22.2, Item I.G.1 of Supplement No. 11 to the Safety Evaluation Report (NUREG-0053) for North Anna Power Station, Unit 2, dated August 1980.

Should you have any questions or require additional information, please contact this office.

c) f q

g Very truly yours, s

9 k(gi,'2.psv$t i O.O M c8 S;

R. H. Leasburg Vice President - Nuclear Operations l

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Attachment

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cc:

Mr. James P. O'Ref*.ly, Director Office of Inspection and Enforcement Region II l

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8107280263 810723 PDR ADOCK 05000339 E

PDR

Attechm:nt v

Pags 1 NATURAL CIRCULATION TEST ON SURRY SIMULATOR A preliminary test conducted on the Surry Simulator following the training during low-power testing conducted on North Anna Unit 2 disclosed a need for model changes. The following model changes wcre made:

1. Improved simulation of natural circu?.ation
2. Modified incore thermocouple response to indicate the effects of core heat, instead of following Tave.

i

3. Modified RTD bypass temperature indication to respond to low flow conditions.
4. Added representation of heat stored in the reactor head during low flow conditions.

Figure 1 compares the results of the natural circulation test on the Surry Simulator to the results of the North Anna Unit 2 test following the model changes.

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