ML19351A237
| ML19351A237 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 07/13/1989 |
| From: | Liza Cunningham Office of Nuclear Reactor Regulation |
| To: | Ronald Bellamy, Dan Collins, Greger L NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 8907200118 | |
| Download: ML19351A237 (8) | |
Text
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- p JUL 13 C99
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MEMORANDUM FOR:
Ronald R. Bellamy, Chief. EPRPB, DR$5, Region I Douglas M. Collins Chief. EPRPB, DRSS, Region 11 i
L. Robert Greger, dhief, RPB, DR$5, Region III i
Blaine Murray, Chief, RPSB, DR$$, Region IV Gregory P. Yuha.. Chief. EPRPB, DRSS, Region Y j
FROM:
LeMoine J. Cunningham, Chief L
Radiation Protection Branch i
Division of Radiation Protection and Emergency Preparedness l
Office of Nuclear Reactor Regulation l
SUBJECT:
LEAKAGE PRDBLEM WITH CHECK SOURCES SUPPLIED BY SORRENTO ELECTRONICS / GENERAL ATOMICS j
In a memorandum dated June 13,1989, R. R. Be11any, Region I, informed me of a potential generic problem associated with some check sources supplied by l
Sorrento Electronics (SE)lem was discovered when a leaking SE check source a subsidiary of General Atomics, San Diego, Califor-i nia. This potential prob i
resulted in personnel contamination at Seabrook. The discovery of these laaking sources was below the threshold for 10 CFR Part 21 reporting.
l We contacted Sorrento Electronics and suggested that they inform their custom-l ers of the problem. Sorrento Electronics responded with the enclosed " Quality Assurance Bulletin," dated June 1989, which was provided to SE customers with Radiation Monitoring System Equipment.
We plan no further action on this matter.
3 Oryinal signed by Thomas H. Esss "l
LeMoine J. Cunningham Chief
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iRadiation Protection Branch T
Of'thf%i[ Md1ETEh Prestetioil Qpg f
- N and Emergency Preparedness Q
Office of Nuclear Reactor Regulation r-
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V. Camacho, SE l
CONTACT:
l John D. Buchanan, NRR 492-1097 1
L Distribution:
Ncongel, NRR LJCunningham, NRR JEWigginton, NRR THEssig, NRR l
JDBuchanan, NRR WDTravers, NRR RJBarrett, NRR JWNHickey, HMSS DACool, RES PDR RLAnderson, TTC Central Files I
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1 1,11 Y AMWAWE Wil,EIM tuctosunF SostitENTO ELECTRONICS June, 1989 1he Sorrento Electronics (SE) Quality Bulletin ii provided to customers with SE Radiation Monitoritig Systes equipment.
A bulletin is issued when we feel a quality-related top!c would be of it.terest to c ur users. Further information may be obtained from the contact listed at the e.id of the bulletin.
sasavaasssssssssssssssssssssssssssssesassessssssssesesses
SUBJECT:
.' Chlorine-36 Checksource Leachis3 The Seabrook station recently experienced Chlorine-36 leaching from a checksource used in the RD-7, RD-108, RD-11 and RD-12HT detectors.
In addition, the foil window covering the sourse cavity fell off. These two conditions exhibited theorelves on detectors subjected to high humidity.
The following checksource history is proviced for your infornation:
1.
The checksourco in the RD-7, RD10B, RD.11 RD-12 or RD-12HT detector is cl-36 salt with an activity level of 1.25 uC1 or le s.
It is manufactured by General Atomics or Isotope l'roducts Laboratories.
2.
The Cl-36 salt is located in a cavity in the source 61 der. It is held i
in place with Mylar, Kapton or thin aluminue tape that acts as a window for the Beta particles.
l 3.
For the RD-7, prior to 12/85, the window was.00C25 inches of aluminum, Mylar, or Kapton tape wrapped over the cavita and epoxied in place.
(See dwg 0281-0736 Rev. D) Between 12/85 and 5/(7. the window was 8 ag/sq cm Kapton tape wrapped o'..n the cavity. After S/87, the source is installed in a cavity in a plug +. hat is inserted into 3he end of the eere* eM c?.C epoxied in place. (See dwg 0281-0736 Rev. FJ 4.
For the RD-108, RD-11, RD-12. and RP-lhq ? HMyr thEliEmissest prist u EE7 h aWin Eks listalled th a bavity in th~e source bolder and an alubinus or Kspton window was ceaeuted over the cavity.
Optional construction provided a ring for rataining the window. (See dwg 0281-0068 Rev. E) Since 6/87, the source is placed in a counterbore in the source i
holder and held in place with a plug.
The plus has a.002 itch thick t
window. The plug is epoxied in place in the counterbore. (See dwg 0281-0068 Rev. G) 4 It is reconsended that each plant check their chlorine-bearing detectors to ensure that the checksource is adequately cemented in place. Seabrook is using Conathane epoxy, manufactured by Conap, to cement the checksource.
Please contact Victor Camacho at (619) 457-8863 or our Eastern office at (919)481-4425 for more information.
in ed LL y Nancy J.
ter Director, Gdality Assurance y e _
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UNITED STATES l
NUCLEAR REGULATORY COMMISSION
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W ASHINGT ON, D.C. 20655 f
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October 13, 1989 l
i MEMO FOR J. HCLNIGHT h
Bubji keleese of drawin:2 accompenying SE i
Quality Assurance Bulletin on Chlorine-36 Chec6 source Leaching f
\\
Victor Camacho (619) 457-8883 of Sorrento I
Electronits, a subsidiery of General A'ori;.,
is the point of contact on the subject drawings (General Atomic /Sor rento Electronics 0201-07361 i
02B1-0068), which were rubmitted to NRC f or distribution and without cleie of confidentialit<.
Since the drawings contained preprietary legends, i
Mr. Camacho wen contacted to determine if the
(
j company was seeking protection of the drawings as i
I pr opr i et er y.
He niiditated it was not end that l
the drawings were 17 tended to be made available 1
with the associated bulletin.
He expressly stated tho, there was no objection to the d,rawings being f
pieced in the Fublic Document Fcom.
The legends f
have been stricien in accoroance therewith.
You ety proceed with Mr. buchenen't. request to place the attached docueents in the CF and PDR.
Please feel f r ee to cont ec t me on X21560 if you heve any questions in this regard, g
bi l
Catherine M.
Wolfle OGC, i.cministration D.
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