ML19250B777
| ML19250B777 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay, Diablo Canyon |
| Issue date: | 10/19/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7911050223 | |
| Download: ML19250B777 (1) | |
Text
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}Q jearo UNITED STATES a
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NUCLEAR REGULATORY COMMISSION n
O-E REGION V o
1990 N. CALIFORNIA BOULEVARD SulTE 202, WALNUT CREEK PLAZA 4,,+
WALNUT CREEK, CALIFORNIA 94596 October 19, 1979 Docket Nos. 50-133 50-275 50-323 Pacific Gas and Electric Company 77 Beale Street San Francisco, California 94106 Attention: Mr. Philip A. Crane, Jr.
Assistant General Counsel Gentlemen:
Enclosed is IE Circular No. 79-21, " Prevention of Unplanned Releases of Radioactivity," which provides information on inadvertent releases and on-site spills of radioactivity. Should you have any questions related to the enclosed suggested preventive measures, please contact this office.
Sincerely,
/WNcLG~.
R. H. Engelken Director
Enclosures:
1.
IE Circular No. 79 91 2.
IE Circulars Issued in the Last Six Months cc w/ enclosures:
W. Barr, PG&E W. Raymond, PG&E R. Ramsay, PG&E, Diablo Canyon E. Weeks, PG&E, Humboldt Bay J. Worthingten, PG&E 1271 136~
7unoso?f3
Accession No.:
7908220128 SSINS:
6830 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 October 19, 1979 IE Circular No. 79-21 PREVENTION OF UNPLANNED RELEASES OF RADI0 ACTIVITY ~
Numerous incidents of unplanned releases of radioactivity have been reported to the NRC within the past few months. These incidents of leaks, overflows and spills have resulted in containation of areas outside of plant buildings.
The attached table provides you with summary information on these events, their apparent causes, the radiological consequences and the corrective actions.
We believe that a number of these incidents coula have been avoided and preven-tive actions for these types of unplanned releases should be instituted by all reactor licensees.
Based on the reported incidents, the following preventive measures can minimize the occurrence of such events.
1.
Review of procedures for transfer of radioactive liquids.
Errors in written procedures have led to mistakes in valve line-ups and tank overflows.
Written proceduras, including check lists for valve line-ups, should be developed and followed for operations which could cause spills of radioactivity. Management controls, including audits, should be employed to assure verbatim compliance with such procedures.
2.
Review of "as built" systems having the potential of inadvertent releases because of design or construction errors. Consider items such as:
a.
Tank overflows shoJ1d be routed to liquid radwaste tanks.
b.
Storm drains should be located away from areas with a high potential for spills.
c.
Consideration should be giver. to drip pans under equipment, such as pumps and valves, from which leakage is expected.
d.
Cofferdams should be installed under doors to areas with a potential for radioactive spills.
e.
Preoperational testing should verify that crossconnects do not exist that would permit radioactivity unit (s) under construction.
D N N DO N M 3.
Periodically functionally test and pe of systems that could cause an inadve Entire document previously corrosion degradation have occurred i entered into system under:
to cause leaks. New permanent and te ANO I271 137
- 80. of gases: _.
.