ML20084F554
| ML20084F554 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 04/23/1984 |
| From: | Fay C WISCONSIN ELECTRIC POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20084F539 | List: |
| References | |
| NUDOCS 8405040231 | |
| Download: ML20084F554 (3) | |
Text
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WlSCORSin Electnc eom come 231 W. MICHIGAN, P.O. BOX 2046. MILWAUKr.E. WI 53201 April 23, 1984 Mr. J.
G.
Keppler, Regional Administrator Office of Inspection and Enforcement, Region III U.
S.
NUCLEAR REGULATORY COMMISSION 799 Roosevelt Road Glen Ellyn, Illinois 60137
Dear Mr. Keppler:
DOCKET NOS. 50-266 AND 50-301 RESPONSE TO NRC INSPECTION REPORT NOS.
50-266/84-02 AND 50-301/84-01 POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 In response to the subject inspection reports dated March 26, 1984, the following is provided pursuant to 10 CFR 2.201:
1.
Containment High-Range Radiation Monitors Our procedure HPCAL 3.25 has been revised tc require the recording on a specific form of the results of the high-range source calibration performed on a refueling basis.
Similarly, procedure HPIP 7.51A has been revised to require the recording on a specific form of the results of the internal check soarce calibration performed on a monthly basis.
These corrective actions have been completed.
Calibration checks made subsequent to the inspection have verified the correct operability of the monitors during the period in question.
2.
Portable Shielding We have reviewed the portable shielding in the vicinity of the control room and the C-59 area and have the following observations:
a.
Based on subsequent work on the temporary shielding, we believe a small crew (two or three men) could have mounted the curtains for the control room in-about two to four hours, not the 18-25 hours originally-estimated.
8405040231 G4050205000266 PDR ADOCK PDR a
0 hPR IO M4
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.4 Mr. J. G. Keppler April 23, 1984 b.
The major. theoretical contribution to accident dose is from a semiinfinite gas cloud formed by containment leakage of 0.4% per day. _However, design calculations conservatively ignore the time required for the buildup of such a cloud.
4 Hence, in reality, the dose received in the enclosed turbine hall around the control room in the first hour or two following an accident is likely to -be small.
Accordingly, in the period from January l' to January 6, there was little risk,-if any, to plant staff due to the short interval needed to mount the curtains provided.
Our inventory of the curtains indicated that only c.
j one half of the design. thickness was in place at the control room due to a misinterpretation of the original design drawings.
This was rectified on April 5.
An analysis of the decrease in shielding indicated a theoretical accident dose of 5.7 Rem.
However, a minor modification of a conservative occupancy factor related ix) time spent at.certain distances from the window resulted in a calculated i
dose within the General Design Criteria (GDC)- of 5 Rem to the whole body.
The revised assumption.is more realistic, yet-still conservative.
t i
d.
The racks have now been stenciled to assure their 2
correct orientation if needed.
All curtains are 1
hung and the curtains.used at the. control room, have been stenciled to indicate.their equivalent i
densities.
As your-inspectors are aware, certain'of the racks l
- e..and curtains in the C-59tarea have been shortened
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to provide' overhead clearance and, thereby, facilitate ~their positioning-in the event of an
~
accident.
Thirty-six curtains are out'for shortening.
at the present time and will be returned on or before May 12.
The number _of_these curtains is.for.our convenience in use and habitability criteria are l
met even.during periods when batches are returned i
.tx) the manufacturer for modification. :This discussion"isLprovided,for your information.
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.> 4 8 Mr. J. G. Keppler April 23, 1984 f.
In summary, while our implementation of this portable shielding was, for.brief periods, less conservative than we originally intended, we believe no significant compromise of GDC or other habitability criteria occurred.
At the present time, the shielding is in its intended.
configuration, except for the convenience shortening of curtains which will be completed on or before May 12.
Very truly yours, d)
Vice President-Nuclear Power C. W. Fay l
Copy to NRC Resident Inspector i
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