ML20039B378
| ML20039B378 | |
| Person / Time | |
|---|---|
| Issue date: | 09/10/1981 |
| From: | Liza Cunningham NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | Book H, Brown G, Gibson A, Greger L, Joyner J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| REF-SSINS-6400 NUDOCS 8112220606 | |
| Download: ML20039B378 (2) | |
Text
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TERA SEP u y MEMORANDUM FOR:
J. H. Joyner, Chief. TI Branch, Region I A. F. Gibson, Chief TI Branch, Region II.
L. R. Greger, Acting Chief. TI Branch, Region III G. D. Brown, Chief, TI Branch, Region IV H. E. Book, Chief, TI Branch, Region V FROM:
L. J. Cunningham, Chief, Reactor Radiological Safety Section, RSB:IE
SUBJECT:
NRC POSITION RE: MONITORING OF STORM DRAINS Enclosed for your information is an EDO reply to Comissioner Bradford regarding monitoring of storm drains. This information may be of general interest to you and your staffs.
L. J. Cunningham, Chief Reactor Radiological Safety Section:RSB:IE
Enclosure:
As stated cc:
L. B. Higginbotham, IE RRSS Staff
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i AUG 2 81981 ME"0RAMDU1 FOR: Connissioner Bradford Fn0M:
Willian J. Dircks, Executive Director for Operatiens
SUBJECT:
MOHITORING OF RADI0 ACTIVE RELEASES VIA STOR" DRAlt:5 Ucrthern States Power Connany recently reported that an unnonitored release of radioactive water occurred on July 30, 1981, at the Monticello niant.
Eased on this and similar occurrences at fM11 stone, Unit 1 (June 21,1981) and at the Japanese Tsuruga plant, you asked if there were technical reasons for not continuously nonitoring these paths.
As pointed out in ny rencrandun of July 14,19c1, concerning the Millstone release, the re::uirenents of MRR are that during nomal reactor operation, including anticipated operational occurrences, all major and potentially sienificant paths for release of radioactive raterial shnuld be nonitored (10 CFR 50, Appendix A, General Design Criterion 64; Reculatory Guide 1.21, Fosition C.2). Plants are designed and reviewed, and Technical Specifications are crevided, to assure that durino normal operation and anticipated opera-tional occurrences, all such release paths are nonitored.
At Monticello, an unreviewed and improper action by a plant engineer resulted in radioactive water being encloyed in the cement solidification of radioactive resin waste at a newly-installed portable solidification systen located in the raduaste shippinc building. This building has no floor drains or curbs to pre-vent water fron escaping.
The building had not been designed for the type of use which was nade of it by addition of the solidification systen; the defi-ciency is being corrected by the licensee. The proposal for installation of the systen had been reviewed by plant nanacenent and had called for the use of "ceioni:ed water" for nixing with resin and cenent so as to provide control of the pH of the nixture; the resconsible enc:ineer inoroperly end inadvertently l
used slightly radioactive water from the reactor's condensate storace tank.
A rubber hose used to supply the water, secured by neans of a hose clant to i
the pioing of the concrete nixing systen, car
- loose, pernittino an estirated l
?,000 callons of radioactive water to snill onto the concrete ficor of. the i
rad-aste storage building. The water ran down the slocino ficor, under two closed overbead carage-type doors, and into the storn drain sy It is esti ated tha* 100 callons of water, contaninated to 4.5 x 10 yten.
uti/n1 of I-131 and 1.4 x 10-6 uCi/n1 cf I-133, entered the Mississippi River at the storn l
dr?in outfall, with the remainder of the water entering the soil or being trapped in the storn dr.lin ditches. The release concentrations totaled an-proxinately 300% of naxirun pernissible concentration (MPC, per 10 CFF. 20, Amendix B, Table II, Colunn 2) at the pcint of release; dilution and disner-rinn in the "is3issioni River are asstr'ed to have resulted in essentially instantaneous reduction te non-detectable concentrations with essentially zero envirnn~ ental radiaticn dose inpact.
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