ML17207A347

Forwards Proprietary Version of CEN-115-P,in Response to IE Bulletin 79-06C Items 2 & 3.Response Withheld (Ref 10CFR2.790)

ML17207A347
Person / Time
Site:	Millstone, Calvert Cliffs, Palisades, Saint Lucie, Arkansas Nuclear, Maine Yankee, Fort Calhoun
Issue date:	08/29/1979
From:	Liebler G ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY, EMVC-EPS
To:	Stello V NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
NUDOCS 7909040506
Download: ML17207A347 (5)

Text

R'EGULA TVR Y INFORMATION 0 ISTR I BUT ION SYSTEM (R I OS 3 ACCESSTQN NBA'7909040500 C,DATE: 79/08/29 NQTANI NQ FACIL!50 ?55 Palfsades Nuc ear Planti Consumer s Power io, 50 2SS Fort Calhoun Statfon~ Unft lp Omaha Puolfc Po~er Ofst 50 309 Hafne Yankee Atomfc Power Planti Nafne Yankee Atomfc AUTH ~ NAFK AUTHOR AFFIt ZATION LIEBLERrG ~ E ~

C K Power Systems REC IP 4ANE RKCIP IEN 7 AFFILIATION STELLO.V.

Ottf ce of Znspectf on

& Enforcement

SUBJECT:

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August 29, 1979 Mr. Victor Stello, Director Office of Inspection 8 Enforcement U.S. Nuclear Regulatory Commission Mashington, D.C.

20555

Subject:

Thirty Day Response to IE Bulletin 79-06C Dockets:

50-335

{FPSL), 50-317 and 50-318 (BGSE), 50-368 (APSL),

50-309 (MY), 50-336 (NE Utilities), 50-255 (CPCo.)

and 50-285 (OPPD)

Enclosures:

(1)

CEN-115-P,

Response

to NRC IE Bulletin 79-06C Items 2 and 3

for Combustion Engineering Nuclear Steam Supply Systems (Proprietary version, copy 80000/ 4 through 00002 G)

(2)

CEN-115-NP (Non Proprietary version of Enclosure (1))

{3)

Proprietary Information Affidavit for CEN-115-P

Dear Mr. Stello:

Enclosures (1) and (2) are forwarded for your review.

Please note that this report constitutes the response to the short term action items number (2) and (3) of IE Bulletin 79-06C.

The information presented in CEN-115-P is gendric in nature and applies to all operating C-E designed reactors.

The results of analysis contained in the attached report indicate the need to trip reactor coolant pumps within approximately 10 minutes for a small subset of small break LOCA's.

In response to Long Term Action Item 1 of IE Bulletin 79-06C, we consider it premature to propose a design for auto-matic tripping of RCPs.

The bases for this conclusion are:

(1)

Best Estimate calculations with both HPSI pumps show no need for pump tripping.

(2)

Analytical modeling of these events is evolving and may alter conclusions.

(3)

The identified small breaks of concern represent a small subset of the entire break spectrum.

{4)

Other design alternates exist to provide equivalent core protection.

It is judged that the guidelines provided in response to Bulletin Item 3 provide adequate core protection.

Me will continue to closely monitor all developments on this subject so that these guidelines continue to ensure safe plant operation.

~P p OpO vo uo 604

r.

Due to the proprietary nature of some of the material contained in CEN-115-P, we request that it be withheld in accordance with provisions of 10 CFR 2.790 and that this material be safeguarded.

The reasons for the classification of this material as proprietary are delineated in the enclosed affidavit.

Five copies of both Enclosures (1) and (2) are included with this letter for immediate delivery.

Thirty-five additional copies of Enclosure (1) and fifteen copies of Enclosure (2) will be forwarded,via the regular mail service.

Should questions arise concerning this report, please feel free to contact myself at (305) 552-3811 or Mr. Ken Morris of Omaha Public Power District at (402) 536-4504.

Sincerely, 8~7 George E. Liebler, Chairman C-E Owners Group cc:

Dr. D. F.. Ross, Manager (w/o attach)

Bulletins 5 Orders Task Force

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Mr. I. Villalva, (with'attach)

Dr Harold Denton (w/o attach)

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'OCKET NO. 93$

/gag DATE:

J3C NOTE TO NRC AND/OR LOCAL PUBLIC DOCUMENT ROOMS from The following item submitted with letter dated

-a-9 is being withheld from public disclosure in accordance with Section 2.790.

PROPRIETARY INFORMATION Distribution Service's Branch