ML20065Q533
| ML20065Q533 | |
| Person / Time | |
|---|---|
| Site: | 05000000, Brunswick |
| Issue date: | 07/06/1976 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | Goller K Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20064E577 | List: |
| References | |
| FOIA-82-389 NUDOCS 8210280021 | |
| Download: ML20065Q533 (3) | |
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UNITED STATES t
NUCLEAR REGULATORY COMMISSION WASHINGTON, D. c. 20555
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JUL 0 61976 Karl R. Coller, Assistant Director for Operating Reactors, DDR BRUNSWICK UNIT 2 - COOLANT ACTIVITY LIMITS l
It has been brought to our attention that the present technical specifications for the Brunswick Unit 2 plant allow the equilibrium coolant activity to be as high as 6.2 pCi/ gram I-131 Equivalent and f
62.. pCi/ gram during 48-hour spike periods. We estimate that these limits may result in offsite doses in excess of 10 CFR Part 100 guidelines following a postulated main steam line failure outside containment (see Enclosure 1).
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We recommend that the Brunswick Unit 2 coolant activity limits be changed to conform with the Standard Technical Specifications -(0.2 and 4.0 pCi/ gram of I-131 Equivalent, respectively) at the same time that Unit I reverts to the Standard Technical Specifications or at the next Unit 2 refueling outage, whichever comes first. These limits would result in appropriately low doses (5 rem and 100 rem) for a postulated steam line failure accident but should not represent a hardship to the facility since it has so far oper.ated below these limits (see Enclosure 2).
nA arrell G. Eisenhut, Assistant Director for Operational Technology
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Division of Operating Reactors
Enclosures:
As stated i
cc:
V. Stello B. Grimes D. Bunch A. Schwencer C. Trammell E. Adensam W. Pasedag
/H.Fontecilla d 2--
8210200021 820917
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ENCLOSURE' 1 BRUNSWICK UNIT 2 - STEAM LINE FAILURE ACCIDENT Assumptions:
1.
140,000 lb of reactor coolant instantaneously released to the.
environment. (SRP 15.6.4)
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8 X/Q = 7.4 x 10 sec/m at 914 meters for an eleva,ted release with fumigation (Regulatory Guide 1.5) and corrected for a wind speed of 0.5 m/sec.
Thyroid Doses:
1.
With Coolant Concentration
= 6.2 pCi/ gram I-131 Equivalent 150 rem 2.
With Coolant Conce,ntration
= 62, pCi/ gram I-131 Equivalent 1500 rem
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ENCLOSURE 2 INFORMATION OBTAINED BY TELEPHONE CONVERSATION BE1VEEN C. TRAMMELL, ORPM, AND BRUNSWICK UNIT 2 PERSONNEL ON JULY 2,1976
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Average operating I-131 Coolant Activity 10 pCi/cc June 22 Primary Coolant Activity measurement:
~0 I-131 2.17 x 10 pCi/cc I-133 1.79 x 10 ' pCi/cc June 24 Primary Coolant Activity measurement:
I-131 3.54 x 10 pCi/cc
-5 I-133 5.
x 10 pCi/cc O
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