ML15222A958

ENT000664 - Email from J. Holonich, NRC, to K. Amberge, EPRI, Et Al., Summary Tables for CASS Position (Mar. 12, 2014, 1:23 PM)

ML15222A958
Person / Time
Site:	Indian Point
Issue date:	03/12/2014
From:	Entergy Nuclear Operations
To:	Atomic Safety and Licensing Board Panel
SECY RAS
References
RAS 28136, ASLBP 07-858-03-LR-BD01, 50-247-LR, 50-286-LR
Download: ML15222A958 (2)

Text

ENT000664 Submitted: August 10, 2015 From: Holonich, Joseph Sent: Wednesday, March 12, 2014 1:23 PM To: Amberge, Kyle; 'Contractor - Wirtz, Charles' Cc: Hardies, Robert; Hiser, Allen; Cheruvenki, Ganesh; Poehler, Jeffrey; Tregoning, Robert; Purtscher, Patrick; 'Andrew.Odell@exeloncorp.com' (Andrew.Odell@exeloncorp.com); Dyle, Robin; Rao, Appajosula

Subject:

Summary Tables For CASS Posittion.docx Attachments: Summary tables for CASS posittion.docx Kyle/Chuck, As discussed today during our conference call, attached please find the subject tables. They are being provided to you for your use. The NRC staff would welcome any comments you may have.

A copy of this Email and the attachment will be placed in ADAMS and made publically available.

Joe Holonich

Proposed NRC position on Screening of CASS Reactor Vessel Internal Components The NRC staff requires licensees/applicants to consider embrittlement from both thermal aging and neutron irradiation. The staff would consider screening for susceptibility to embrittlement based on fluence and ferrite content (measured or calculated from Hulls equation and summarized in Tables A, B, and C shown below) to be conservative.

Table A Screening for Components with < 0.45 dpa neutron exposure Molybdenum (wt. %) Casting Method Susceptibility Delta ferrite %

TE > 14%

static High 2.0-3.0% No 14%

(CF-8M) TE > 20%

centrifugal No 20%

TE > 20%

static Low 0.5% max No 20%

(CF-3 and CF-8) centrifugal No All Table B Screening for Components with 0.45 dpa neutron exposure 1.5 dpa Molybdenum (wt. %) Casting Method Susceptibility Delta ferrite %

TE + IE > 10%

static High 2.0-3.0% No 10%

(CF-8M) TE + IE > 15%

centrifugal No 15%

TE + IE > 15%

static Low 0.5% max No 15%

(CF-3 and CF-8) centrifugal No All Table C Screening for Components with > 1.5 dpa neutron exposure Molybdenum (wt. %) Casting Method Susceptibility Delta ferrite %

TE + IE > 10%

static High 2.0-3.0% IE 10%

(CF-8M) TE + IE > 15%

centrifugal IE 15%

TE + IE > 15%

static Low 0.5% max IE 15%

(CF-3 and CF-8) centrifugal IE All