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“Bulletin 88-08: Supplement 1, Thermal Stresses in Piping Connected to Reactor Coolant Systems
OMB No.: 3150-0011
NRCB 88-08, Supplement 1

UNITED STATES
NUCLEAR REGULATORY COMMISSION
OFFICE OF NUCLEAR REACTOR REGULATION
WASHINGTON, D. C. 20555

June 24, 1988

NRC BULLETIN NO. 88-08, SUPPLEMENT 1: THERMAL STRESSES IN PIPING CONNECTED
TO REACTOR COOLANT SYSTEMS

Addressees:

All holders of operating licenses or construction permits for
light-water-cooled nuclear power reactors.

Purpose:

The purpose of this supplement is to 1) provide preliminary information to
addressees about an event at Tihange 1 that appears to be similar to the
Farley 2 event and 2) emphasize the need for sufficient examinations of unisolable piping connected to the reactor coolant system (RCS) to assure that there are no rejectable crack or flaw indications. No new requirements
are included in this supplement.

Description of Circumstances:

Tihange 1 is an 870 MWe, Westinghouse-type, 3-loop, pressurized-water reactor
located at Tihange…