ML20059J799
| ML20059J799 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 01/19/1994 |
| From: | Schnell D UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20059J804 | List: |
| References | |
| ULNRC-2939, NUDOCS 9402010190 | |
| Download: ML20059J799 (3) | |
Text
1901 Chouteau Avenue Post D%ce Box 149 St. Louis. M:ssowili3it:5 314-55? ?650 Donald F. Schnell MQy Etucnuc
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r3 January 19, 1994 U.S. Nuclear. Regulatory Commission ATTN:
Document Control' Desk Mail Station P1-137 Washington, D.C. 20555 Gentlemen:
ULNRC-2939 DOCKET NUMBER 50-483 CALLAWAY PLANT CONTAINMENT PURGE MONITOR SETPOINT EASES'
References:
1.
ULNRC-1423 dated 12-30-86 2.
ULNRC-1465 dated 3-13-87 3.
Amendment No. 20 to FOL NPF-30 dated 4-10-87 Union Electric Company herewith. transmits changes to the Bases for Callaway Technical Specifi-cation 3/4.9.4, Containment Building Penetrations.
The references discuss previously implemented. changes to i
Callaway's containment purge isolation signal (CPIS) i design and Technical Specifications such:that the' containment atmosphere radiation monitors (GT-RE-0031 i
and -0032) no longer provide a purge isolation signal.
To address an NRC Staff concern during the review of Reference 1, a new Surveillance 4.9.4.2 was submitted via Reference 2 to ensure that the CPIS trip setpoint of the containment purge radiation : monitors _(GT-RE-0022 and -0033) is set at less than or equal to SE-03 pCi/cc during core alterations or movement of irradiated fuel within the containment.
Based on the NRC reviewer's.
input, this setpoint was established sufficiently low to. ensure that purge isolation would be initiated upon i
the detection of the first trace of radioactivity
~
released in the event of'a fuel. handling accident. The setpoint of SE-03 pCi/cc was established since.it is approximately equivalent to a 150 mR/hr submersion-dose rate inside containment.
No change is proposed to this refueling operation surveillance or the 4.9.4.2 setpoint; however, the Bases for this surveillance f
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U.S. Nuclear Regulatory Commission Page 2 require a revision.
The purge isolation setpoint was based on a single fuel rod being damaged and 1% of the gap activity being released.
Since gap activity is assumed to be 10% of the rod activity, except for Kr-85 where the assumption is 30% of the rod activity, a 1%
gap activity release corresponds to 0.1% of the noble gas rod activity with 0.3% of the Kr-85 rod activity.
The original setpoint calculation contained an error in the verbal description of the activity release which was then included in Reference 2.
A recent QA surveillance identified this discrepancy.
As stated before, there is no change to the setpoint of SE-03 p Ci/cc or its relationship to a 150 mR/hr submersion dose rate.
The required change involves replacing the word " gap" in Bases 3/4.9.4 with the word " rod".
If you have any questions on the attached Bases change, please contact us.
Ve truly yours, i
('3
,W Donald F. Schnell GGY/jdg Attachment l
I i
s l
i cc:
T. A.
Baxter, Esq.
l Shaw, Pittman, Potts & Trowbridge 2300 N.
- Street, N.W.
],
Washington, D.C.
20037 1
M. H.
Fletcher i
CFA, Inc.
i 18225-A Flower Hill'Way Gaithersburg,.MD 20879-5334 L. Robert Greger Chief, Reactor Project Branch-1 U.S.. Nuclear Regulatory Commission Region III 799 Roosevelt ~ Road l
Glen Ellyn,. Illinois 60137 Bruce Bartlett-Callaway Resident Office U.S.
Regulatory Commission i
RR#1 j
Steedman, Missouri 65077 l
\\
L. R. Wharton (2) i l
Office of Nuclear Reactor Regulation i
U.S. Nuclear Regulatory Commissioni 1
1-White Flint, North, Mail Stop 13E21 11555 Rockville Pike i
Rockville, MD 20852 1
l Manager, Electric Department.
Missouri Public Service Commission P.O.
Box 360 Jefferson City, MO 65102 l
Ron Kucera Department of Natural Resources P.O.
Box 176 Jefferson. City, MO 65102
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