NUREG-0737, Item I.C.l, Abnormal Transient Operator Guidelines (ATOG) (Generic Letter No. 81-16)
UNITED STATES
NUCLEAR REGULATORY COMMISSION
WASHINGTON, D. C. 20555
June 1, 1981
TO ALL B&W LICENSEES (Except Arkansas Nuclear One, Unit One)
Gentlemen:
SUBJECT: NUREG-0737, ITEM I.C.1, ABNORMAL TRANSIENT OPERATOR GUIDELINES
(ATOG) (Generic Letter No. 81-16.)
The staff has completed a preliminary review of the ATOG prepared for
Arkansas Nuclear One Unit One and submitted as generic guidelines in
response to NUREG-0737, Clarification of TMI Action Plan Requirements, Item
I.C.1. We have identified the following deficiencies in areas that were
identified in NUREG-0737, but are not addressed by the ATOG submittal:
1. The bases for the consideration of multiple and consequential failures
is not provided. The sequence-of-event diagrams are not complete (i.e.,
ATWS following an initiating event).
2. Supporting analyses for multiple failures are not presented for all
cases. The description of the computer programs used to analyze the
events is not provided.
3. Operator errors of omission or commission are not addressed.
4. The following multiple failure events are not addressed:
(a) SG tube rupture in more than one steam generator;
(b) Failure of the high-pressure reactor coolant makeup system;
(c) ATWS following an initiating event (with or without a turbine
trip); and
(d) Failure of main and auxiliary feedwater with partial or complete
loss of HPI.
5. The transition from emergency procedures into an adequate core cooling
(ICC) procedure is not developed or included. (We understand that B&W
is incorporating ICC into the ATOG program for some future submittal.)
Since you have referenced this report as applicable to your facility, please
advise us within 30 days of your receipt of this letter of your schedule for
response to these items and the impact this will have on your schedule for
implementing a program of emergency operating procedures that comply with
the requirements of NUREG-0737, Item I.C.1.
.
All B&W Licensees Except -2-
ANO-1
Since the responses required by this letter affect fewer than 10 licensees
and are required to obtain a benefit, they are not subject to Office of
Management and Budget clearance as required by P.L. 96- 511.
Sincerely,
Thomas M. Novak, Assistant Director
for Operating Reactors
Division of Licensing
Page Last Reviewed/Updated Tuesday, March 09, 2021