ML20059K562

Follows Up to Previous Telcon W/Numarc Re Meeting Be Scheduled in Near Future W/Pwr Owners Groups to Discuss Items in Encl Agenda

ML20059K562
Person / Time
Issue date:	01/10/1994
From:	Russell W Office of Nuclear Reactor Regulation
To:	Rasin W NUCLEAR ENERGY INSTITUTE (FORMERLY NUCLEAR MGMT &
References
NUDOCS 9402020159
Download: ML20059K562 (3)

Text

_ ___

t i

January 10,-1994

)

Mr. William H. Rasin, Vice President &

Director Technical Division i

Nuclear Management and Resources Council 1776 Eye Street, N.W., Suite 300 i

Washington, D.C.

20006-2496 l

Dear Mr. Rasin:

This letter is a follow-up to previous telephone conversations between Mr.'J.

Strosnider of my staff and Mr. M. Schreim of NUMARC, requesting that a meeting be scheduled in the near future with the PWR Owners' Groups (0Gs), to discuss the items included in the attached agenda. The NRC is concerned with past information provided by the OGs that stated:

1) all primary system components-were reviewed with respect to residual and operating stresses as well as susceptibility to primary water stress corrosion cracking (PWSCC), and 2) the conclusion that any cracking in Alloy 600 was expected to be only axially oriented. The experience at Palisades (circumferential cracking in the PORV line) brings into question the OGs prior strA es and conclusions that cracking would be predominately axially oriented.

Duiing the meeting we would also like to discuss the outstanding issues in the attachment related to PWSCC in control rod drive mechanism penetrations.

Sincerely, o M _K.8mh m t

William T. Russell, Associate Director for Inspection and Technical Assessment Office of Nuclear Reactor Regulation

Enclosure:

)

As stated DISTRIBUTION:

TMurley PDR Central Files DBrinkman i

EMCB RF WKoo i

DE RF JDavis RHermann BCapra WTRussell JStrosnider g $q /

• SEE PREVIOUS CONCURRENCE tvv u CFFICE DE:EMCB DE:EMCB DE: AD,,,, A. -

NRR:AJ 7,,

NAME

• RHermann:tc

• JStrosnider WHodges WRussell DATE

}/04/94

}/6/94

}/[p /g4

}/p/g4

/ '/

OFFICIAL RECORD COPY

/

FILENAME:

G:\\HERMANN\\PWSCC600. RAH pJ g 7(pygyfye)

.b (

r at JEsuf

)

up w wp 002090

~

0L00fi<1 7,7-p

.n

~z(w.r:y tl

,, g[; g f[, M, (;,

9402020159 940110~

pg PDR REYGP ERONUNRC

A i

January 10, 1994 l

Mr. William H. Rasin, Vice President &

Director Technical Division Nuclear Management and Resources Council i

1776 Eye Street, N.W., Suite 300 Washington, D.C.

20006-2456 i

Dear Mr. Rasin:

This letter is a follow-up to previous telephone conversations between Mr. J.

Strosnider of my staff and Mr. M. Schreim of NUMARC, requesting that a meeting be scheduled in the near future with the PWR Owners' Groups (0Gs), to discuss the items included in the attached agenda. The NRC is concerned with past information provided by the OGs that stated:

1) all primary system components i

were reviewed with respect to residual and operating stresses as well as i

susceptibility to primary water stress corrosion cracking (PWSCC), and 2) the conclusion that any cracking in Alloy 600 was expected to be only axially oriented.

The experience at Palisades (circumferential cracking in the PORV line) brings into question the OGs prior studies and conclusions that cracking would be predominately axially oriented. During the meeting we would also like to discuss the outstanding issues in the attachment related to PWSCC in control rod drive mechanism penetrations.

Sincerely,

- - ~.

ore N,$@N!!DBS i

William T. Russell, Associate Director for Inspection and Technical Assessment Office of Nuclear Reactor Regulation i

i

Enclosure:

As stated i

DISTRIBUTION:

TMurley PDR Central Files DBrinkman EMCB RF WKoo l

DE RF JDavis i

RHermann BCapra i

i WTRussell JStrosnider u3 Nn -

• SEE PREVIOUS CONCURRENCE mu-OFFICE DE:EMCB DE:EMCB DE:AD,ab NRR:ADT l

m ynew -

WE

• RHermann:tc

• JStrosnider WHodges WRussell DATE

}/04/94

}/6/94

}/[p/94

}/')/94

/ /

OFFICIAL RECORD COPY

/

FILENAME:

G:\\HERMANN\\PWSCC600. RAH pg h

i vP 1

I

AGENDA TOPICS l

PWSCC ON PRIMARY SYSTEMS GENERIC ISSUES I) DISCUSSION OF PAST OWNERS GROUPS EFFORTS TO IDENTIFY AREAS SUSCEPTIBLE TO IGSCC IN THE PRIMARY SYSTEM 0F PWRs l

2) DISCUSSION OF THE DEGREE TO WHICH PAST OWNERS GROUPS EFFORTS FOCUSED ON IDENTIFYING AREAS POTENTIALLY SUSCEPTIBLE TO CIRCUHFERNTIAL CRACKING

3) IMPLICATIONS OF THE PALISADES CIRCUMFERENTIAL CRACK IN THE PORV LINE

4) OWNERS GROUPS EVALUATIONS OF RESIDUAL STRESSES IN VARIOUS TYPES OF WELDS (E.G. BUTT WELDS, PARTIAL PENETRATION WELDS)

AND THEIR POTENTIAL FOR SUPPORTING CIRCUMFERENTIAL CRACK DEVELOPMENT

5) OWNERS GROUPS EVALUATIONS OF MATERIAL AND ENVIRONMENTAL SUSCEPTIBILITIES TO IGSCC

6) OWNERS GROUPS EVALUATIONS OF THE EFFECTIVENESS OF ISI/NDE IN MONITORING FOR IGSCC ISSUES RELATED TO CRDM CRACKING I) OWNERS GROUPS EFFORTS TOWARDS ON LINE MONITORING 0F THE CRDM PENETRATIONS USING, FOR EXAMPLE, AC0USTIC TECHNIQUES OR AIRBORNE RADIATION MONITORS.

2) DISCUSSIONS ON FLAW ACCEPTANCE CRITERIA

3) OWNERS GROUPS THOUGHTS ON MISSLE SHIELDS AB0VE CRDM'S.

4) OWNERS GROUPS EVALUATION OF THE EFFECTS OF STRAIGHTENING THE CRDM'S ON CRACK ORIENTATION.

5) OWNERS GROUPS ASSESSMENT OF THE CIRCUMFERENTIAL CRACK AT BUGEY

,