ML19250C123
| ML19250C123 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 10/19/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| NUDOCS 7911080257 | |
| Download: ML19250C123 (1) | |
Text
\\
p neauq),
UNITED STATES
,e, _
y ;
3.,,(
g NUCLEAR REGULATORY COMMISSION G g'y.
j REGION 1 0,
- A 631 PARK AVENUE
% ' N +# [4 KING OF PRUSSIA, PENNSYLVANIA 19406 Docket Nos. 50-245 50 A23 DCT 1 91973 50-336 Northeast Nuclear Enercy Company ATIN: Mr. W. G. Couns11 Vice President - Nuclear Engineering and Operations P. O. Box 270 Hartford, Connecticut 06101 Gentlemen:
Enclosed is IE Circular No. 79-21. " Prevention of Unplanned Releases of Radioactivity," which provides information on inadvertent releases /on-site spills of radioactivity. Should you have any questions related to the enclosed suggested preventive measures, please contact this office.
Sincerely, smr>-M. bl/An oyce H. Grier ector
Enclosures:
1.
IE Circular No. 79-21 2.
List of IE Circulars Issued in the Last Six Months cc w/encls:
K. W. Gray, Construction Quality Assurance Lead H. R. Nims, Director of Nuclear Projects J. F. Opeka, Station Superintendent D. G. Diedrick, Manager of Quality Assurance J. R. Himmelwright, Licensing Safeguards Engineer 1274 200 7 911080 @ b ~
s ENCLOSURE 1 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 reculted in contamination 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 could 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 procedures, 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 should 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 given 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 shc that would permit radioaci Lnit(s) under constructiol DUPLICATE DOCUPINT 3.
Periodically functionally test Entire document previously of systems that could cause an entered into system und r:
corrosion degradation have occi sf )
} J [ (p to cause leaks.
New permanent ANO
/
O 27A 201 no-of P^9e=