ML20077M676

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Informs of Results of Reevaluations of Instrument String Error & RCS Physical Configuration Factor Associated W/ Subcooling Margin Monitor Sys.Subcooling Margin of 25 F Remains Valid.Calculations Encl
ML20077M676
Person / Time
Site: Crane Constellation icon.png
Issue date: 09/07/1983
From: Hukill H
GENERAL PUBLIC UTILITIES CORP.
To: Stolz J
Office of Nuclear Reactor Regulation
References
5211-83-250, NUDOCS 8309120397
Download: ML20077M676 (17)
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Text

-

- Nuclear tsu"m;;r""

Route 441 South Middletown, Pennsylvania 17057 0191 717 944 7621 TELEX 84-2386 Writer's Direct Dial Number:

September 7, 1983 5211-83-250 Office of Nuclear Reactor Regulation Attn:

J. F. Stolz, Chief Operating Reactors Branch No. 4 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C.

20555

Dear Sir:

Three Mile Island Nuclear Station, Unit 1 (TMI-1)

Operating License No. DPR-50 Docket No. 50-289 25 F Subcooling Margin The purpose of this letter is to inform you of the results of recent reevaluations of instrument string error and the RCS physical configuration factor associated with the subcooling margin monitor system.

In our letter of March 31, 1983 (5211-83-017), GPUN indicated that a 25 F subcooling margin (SCM) action point for RCP trip was justified based on calculations performed during accident conditions (i.e., SB LOCA) which showed that the maximum string error for pressures greater than 300 psig is -18.7 F (+21.7 F) with an assumed 5 F physical configuration factor. This factor was assumed to bound any difference between the indicated pressure at the hot leg pressure instrument and the actual pressure at the top of the hot leg.

Since March, we have reevaluated both the physical configuration factor and the string error.

These evaluctions concluded that the 5 F physical configuration factor could be reduced to less than 1.3 F (Ref.1) to account for the elevation difference from the instrument tap to the top of the hot leg.

Additionally, GPUN has reviewed RC pump head degradation for two phase flow and determined that for an indicated 25 F SCM, the void fraction at the RC pump inlet is less than 5% for RC pressure above 865 psig.

Using a very conservative RC pump head / void fraction correlation (Ref. 2), the head degradation is less than 10%. The instrument error for SB LOCA was reevaluated using more conservative assumptions and determined to be + 22.1 F (Ref. 3 & 4) and for normal conditions was

~

evaluated to be + 10.3 F.

These changes do not alter our conclusion that the 25 F indicated subcooling margin action point for RCP trip is appropriate, but they do modify the assumption used by the Appeal Board in ALAB-729, dated May 26, 1983. The Appeal Board agreed with the 25 F SCM action point "providing the 20 F error in the TMI-l instrumentation f

is not exceeded".

Our reevaluation shows that the instrument string error E"I I

830912039Y NdkOyca=^* n is a subsidiary of the General Public Utilities Corporation \\Q'~~'

PDR ADOCK 05000289 P

PDR

Mr. J. F. Stolz 5211-83-250 exceeds 20 F during SB LOCA conditions, but is entirely offset by the conservatism in the physical configuration factor.

Consequently, our conclusion that the 25 F action point is appropriate remains valid.

Sincerely, v

H. D. Hukill Director, TMI-l HDH:LWH:vj f cc:

R. Conte J. Van Vliet Ref.

1.

GPUN Calculation 110lx-5450-015 (Attached) 2.

EPRI Report (NP2578) "Two Phase Performance of Scale Models:of a Primary Coolant Pump", dated 9/82, p. 6-12 3.

GPUN Calculation 11014-322B-009, Rev. 2 & 3 (Attached) 4.

GPUN Calculation C-1101-655-5350-001 (Attached) h t '

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