ML17334A382

Forwards Alden Research Lab 800205 Ltr Re Containment Sump Model Jet Impingement Tests,In Response to NRC 820317 Request.Tests Indicate That No Mods Are Required for Containment Recirculation Sumps

ML17334A382
Person / Time
Site:	Cook
Issue date:	04/28/1982
From:	Hering R INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	Harold Denton Office of Nuclear Reactor Regulation
References
AEP:NRC:0355A, AEP:NRC:355A, NUDOCS 8205040601
Download: ML17334A382 (5)

Text

REGULATURY I RUAT ION DISTR I8UTION SYST (R IDS)

ACCESSION Nt>R:8205040b01 DOC ~ DATE: 82/04/20 NOTARIZED; NQ DOCKET FAC IL: 50 315 Dona 1 d C ~ Cook Nuc 1 ear Power Pl ant i Un) t 1 i Indi ana L 05050215 50-316 Dona l d C ~ Coom. induc 1 ear Power P 1 ant i Uni t 2i Indiana lt ~M90&~

AUTH.f AI4'E AU THUR AF F IL I A t' ON HER I NG i R ~ F e Indiana lt f~ichigan Electric Co ~

REC IP ~ NAME RECIPIENT AFFILIATION, DEtiTON HE RE Office of Nuclear Reactor Regulationi Director SUt3JE.CT: Forwards Alden research Lab 8002ti5 model Jet impingement testsiin response to NRC 820317 ltr re containment sump reauest.Tests indicate that no mods are reauired for containment recirculation sump'ISTRIBUTION CODE: A001S COPIES RECEIVED:LTR ENCL STZE:

TITLE: General Distribution for af ter Issuance of Operating License NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAh'E LTTR ENCL ID CODE/NAtiE LTTR Eh'CL ORU 01 BC 01 7 7 INTERhAL: 1 0 NRR/DHFS DEPY08 1 1 EL'RR/DL D IR 1 1 NHR/DL/DRAB 1 0 NRH/DS I /f7 A 9 RGN3 1 1

'1 Q~D'LE 04 1 1 1

EXTERNAL: ACRS 09 10 10 t.PDR 03 2 2 t4RC PDR 02 I 1 NSIC 05 1 1 NTIS 1 1 TOTAL NUBBER OF COPIES REQUIRED; LTTR 29 ENCL 27

gl INDiANA II MICHiGAN ELECTRIC COMPANY P. O. BOX 18 BOWLING GREEN STATION NEW YORK'. Y 10004 April 28, 1982 AEP:NRC:0355A Donald C. Cook Nuclear Plant Unit Nos. 1 and 2 Docket Nos. 50-315 and 50-316 .i. '~ ',+

~

License Nos. DPR-58 and DPR-74 CONTAINMENT RECIRCULATION SUMP TEST l I l~

Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Vashington, D. C.

1 20555

Dear Mr. Denton:

This letter and its attachment respond to Mr. Steven Varga's letter of March 17, 1982 and supplements our letter to you of January 28, 1980 (AEP:NRC:0355) which responded to the request for additional information

'enclosed in Mr. A. Schwencer's letter of August 1, 1979.

Please find attached a copy of the Alden Research Laboratory (ARL) letter, from Mr.'Padmanabhan (ARL) to Mr. Marrocco (AEPSC) dated February 5, 1980. The letter indicates that the results of the test performed with water in the sump corresponding to an elevation of 607.0 feet were satisfactory in that there was no noticeable withdrawal of air bubbles through the suction pipe in operation. Based on the results of the test we conclude that no modifications are required to the Donald C.

Cook Plant containment recirculation sumps.

This document has been prepared following Corporate Procedures which incorporate a reasonable set of controls to insure its accuracy and completeness prior to signature by the undersigned.

Very truly yours, R. F. Hering Vice President

/md cc: (attached) 820504060l 820428 PDR ADOCK 05000315 P PDR

Mr. Harold R. Denton AEP NRC:0355A cc: John E. Dolan Columbus R. W. Jurgensen W. G. Smith, Jr. Bridgman R. C. Callen G. Charnoff Joe Williams, Jr.

NRC Resident Inspector at Cook Plant Bridgman

h=

ATTACHMENT TO ALDEN RESEAICH LABORATORY AEP:NRC:0355A WORCESTER POLYTECHNlC !NSTlTUTE Mr. M. Marrocco ~

February 5, 1980 Mechanical Engineering Division American Electric Power Service Corporation 2 Broadway New York, NY 10004 D.C. COOK NUCLEAR POWER STATION CONTAINMENT SUMP MODEL JET IMPINGEMENT TESTS DCC/JET-ARL-178P

Dear Mr. Marrocco:

As per your recent telephone request, we have conducted additional tests simul'ating the 'condenser drain flow jet impingement, with water elevation in the sump corresponding to El. 607'0". This condition presumably describes the switchover of first ECCS train to recircula-tion mode taking into account the volume of water due to ice condenser melt and assuming a break inside the biological boundary (not in'eluded in model) .

Tests were conducted with and without screen blockages (up to 504) and with both drain flow jet and suction pipe velocities increased to

,prototype velocities. Tests indicated no noticeable withdrawal of air bubbles through the suction pipe in operation. Even though large surface air-entrainment due to drain flow jet impingement was observed, most of the bubbles did not penetrate 'the water surface deep enough to enter into the sump area. The few bubbles that entered the sump a ea were large enough to rise up and were not d awn cown under the crane wall extension to the downstream portion of: the sumo. Also, no sicnificant vortices were observed during the testing. Hence, we feel that based on the model test results, th'e sump performed satisfactorily at the above flow condition tested.

If you have any questions, please feel free to call me.

Sincerely, M. Padmanabhan Lead Research Engineer Fluid Machinery HOLOLN. MASSACHUSF TTS or 520 ~ VELEPHOhre 617 829 4323