ML20214P851

Summary of 861105 Meeting W/Lasl Re Technical Evaluation Rept on Prestressed Concrete Reactor Vessel Tendons.Staff Requires Determination Re Listed Items.List of Attendees Encl

ML20214P851
Person / Time
Site:	Fort Saint Vrain
Issue date:	11/25/1986
From:	Hinson C Office of Nuclear Reactor Regulation
To:	Berkow H Office of Nuclear Reactor Regulation
References
NUDOCS 8612040401
Download: ML20214P851 (5)

Text

F.

• p orrf p, g ,

UNITED STATES

.{r, g

j NUCLEAR REGULATORY COMMISSION WASM NGTON, D. C. 20555 k ...+ p8 November 25, 1986 Docket No. 50-267 MEMORANDUM FOR

Herbert N. Berkow, Director Standardization and Special Projects Directorate Division of PWR Licensing-B THUR: 0. D. T. Lynch, Jr., Section Leader Standardization and Special Projects Directorate Division of PWR Licensing-B FROM: Charles. S. Hinson, Project Manager Standardization and Special Projects Directorate Division of PWR Licensing-B

SUMMARY

OF NOVEMBER 5,1986 MEETING WITH LOS ALAMOS NATIONAL LABORATORY (LANL) TO DISCUSS THEIR TECHNICAL EVALUATION REPORT (TER) ON THE PRESTRESSED CONCRETE REACTOR VESSEL (PCRV) TENDONS AT FORT ST. VRAIN (FSV)

On November 5,1986, the NRC staff met with Stan Moore and Erik Fugelso of LANL to discuss their TER on the PCRV tendons at FSV. The attendees of this meeting are indicated in the enclosed List of Attendees.

The objective of this meeting was to review LANL's final TER to determine if it addressed the staff's concerns with the draft TER. In January 1985, LANL was requested to study some of the technical p.roblems at FSV. The objective of Task 2 of this request was to evaluate the performance of the PCRV and its degradedtendonsystem,basedonPCRVsurveilJanceinformation. LANL submitted their draft TER, " Technical Assistance for Fort St. Vrain, Task II PCRV and PCRV Tendon Evaluation," to the staff on March 30, 1986. The NRC staff reviewed this draft TER, and found it to be too analytical for the staff's needs. The staff preferred that LANL take a more practical approach to the problem of PCRV tendon degradation at FSV. On July 21, 1986, the staff technical reviewer provided comments on LANL's draft TER. On September 16, 1986, LANL submitted the revised TER discussed at this meeting.

The revised LANL TER differed little from the draft TER, and it still did not adequately address many of the staff's concerns regarding the FSV PCRV tendons.

In order to better define the staff's concerns, the staff expounded upon each of the thirteen comments contained in the staff's July 21, 1986 letter to LANL.

The LANL contractors stated that the staff's present concerns regarding the PRCV tendons differed from the concerns for which the TER was written.

Nevertheless, the contractor agreed to again revise the TER and contact the staff in approximately two weeks to discuss resolution of the staff's cencerns on the draft TER.

hN P

7

v 1,

, w -C -Novembsr 25,.1986 2'-

.The NRC staff then outlined three ma'jor concerns with the'PCRV tendons at FSV

which were not addressed by LANL's TER. c The staff required determination of:

1). The design margins of the PCRV with respect to the tendons, 2). With the present. amount of tendon degradation, what the remaining safety margin of the PCRV is, and .

3) If the PCRV tendons continue to degrade, what the PCRV safety margin

. will be in'20-30 years.

In order to adequately respond to these major concerns,'the staff requires n someone who.is- familiar with the relevant ASME codes, the FSV Final Safety -

' Analysis ' Report, and the structural- properties of concrete. LANL. agreed to infom the staff on the ' possibility of obtaining the assistance of a person

- with these-qualifications to. respond to these staff concerns. Any work done to.

address these three concerns would be performed uader a new-contract.

original signed by.

Charles S. Hinson, Project Manager 1 ~

Standardization and Special Projects Directcrate

- Division of PWR Licensing-B -

Enclosure:

As stated 4

cc w/ enclosure: .

See next.page-DIS"RIBUTION:

MBeI@F1 Terr.e NRC PDR-

. Local PDR PBSS Reading

FMiraglia-J0GC-Bethesda EJordan-BGrimes JPartlow HThomspon

^

~ACRS-(10)~

PNoonan

. -CHinson

~ 0 Lynch

-HBerkow-KHeitner sb PBSS PBSS D SS$ PBh) nnan. CHinso KHeitner h HBenow

@/86 11/ro /86 11/t4/86 11/y(/86 11/.h/86 1

f e y ,,-.--t*- *7ve- r?d -

• t-e ,e -

e me w ****----+-w-ee eve- ee < c we e-pe- '-*4 we-ow -ewe r+-vw -r et * - - -w -* a

t

. t i, .

The' NRC staff then outlined three major concerns with the PCRV tendons at FSV which were not addressed by LANL's TER. The staff required determination of:

1) The design margins of the PCRV with respect to the tendons,

2) With the present amount of tendon degradation, what the remaining safety margin of the PCRV is, and

3) If the PCRV tendons continue to degrade, what the PCRV safety margin will be-in 20-30 years.

In order to adequately respond to these major concerns, the staff requires someone who is familiar with the relevant ASME codes, the FSV Final Safety Analysis Report, and the structural properties of concrete. LANL agreed to inform the staff on the possibility of obtaining the assistance of a person with these qualifications to respond to these staff concerns. Any work done to address these three concerns would be performed under a new contract.

O /A 4 2 /4 4 Charles S. Hinson, Project Manager Standardization and Special Projects Directorate Division of PWR Licensing-B

Enclosure:

. As stated cc w/ enclosure:

See next page 4

i l

l

K.

- u

-Mr.~R. O. Williams Public Service Company.of Colorado Fort St. Vrain

. cc:

Mr. D. W. Warembourg, Manager- Albert J. Hazle, Director -

- Nuclear Engineering Division- Radiation Control Division Public Service Company. Department of Health of Colorado 4210 East lith Avenue P. O. Box 840 Denver, Colorado 80220 Denver, Colorado 80201

- Mr. David Alberstein, 14/159A Mr. J. W. Gahm, Manager

. GA Technologies, Inc. Nuclear Production Division-Post Office Box 85608 Public Service Company of Colorado San Diego, California 92138 16805 Weld County Road 19-1/2.

Platteville, Colorado 80651 Mr. H. L.-Brey, Manager Nuclear Licensing and Fuel Division Mr. P. F. Tomlinson, Manager ,

Public Service Company of Colorado Quality Assurance Division '

P. 0.. Box 840 . Public Service Company of Colorado Denver, Colorado 80201 16805 Weld County Road 19-1/2 Platteville, Colorado 80651 Senior-Resident Inspector U.S. Nuclear Regulatory Commission Mr. R. F. Walker ,

P. 0. Box.840 ' Public . Service Company of Colorado Platteville, Colorado. 80651 Post Office Box 840 Denver, Colorado 92138 Kelley, Stansfield & 0'Donnell .

Public Service Company Building Commitment Control Program

. Room 900. Coordinator 550.15th Street Public Service Company of Colorado '

Denver, Colorado 80202 2420 W. 26th Ave. Suite 100-D Denver, Colorado 80211 Regional Administrator, Region IV U.S. Nuclear Regulatory Comission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 Chairman, Board of County Comissioners of Weld County, Colorado Greeley, Colorado 80631 Regional Representative Radiation Programs Environmental Protection Agency 4

1 Denver Place .

- 999 18th Street, Suite 1300 Denver, Colorado 80202-2413 e- - - - * . - - - - ' -

. s s Enclosure NRC - LANL Meeting November 5, 1986 ..

LIST OF ATTENDEES Name Organization.

Ken Heitner NRC/NRR/PSSS Erik Fugelso LANL-Stan Moore LANL P. T. Kuo NRC/PWR-B/EB-J. S. Ma NRC/PWR-B/EB-Rom Lipinski NRC/PWR-8/EB

-L. B. Marsh NRC/PWR-B/EB C. S. Hinson - NRC/NRR/PBSS Chet Poslusny NRC/NRR/TAMB I

J j

4

--,,e - - , - - - , - - .-

-c - ,, - - - - . +, - - - - , - w - - , - - . - - , - ,