ML20057F452
| ML20057F452 | |
| Person / Time | |
|---|---|
| Site: | University of Michigan |
| Issue date: | 10/06/1993 |
| From: | Fleming R MICHIGAN, UNIV. OF, ANN ARBOR, MI |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 18, NUDOCS 9310180020 | |
| Download: ML20057F452 (2) | |
Text
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O Nuclear Reactor Laboratory The Un i ve rs i t.y of Michigan Ford Nuclear Henctor phoenix Memorial Laborator'.
2301 Danisteel Boulevard Oct ober 6,
1993 Docke* 50-2 Lira nse H-28 United States Nuclear Hegulatory Commission Atin: Document Cont rol Desh Washington, D.C.
20555 Re po r t.a b l e Occurrence No.
18 Helease of how hevel Radioact.ive Water from the Ford Nuclear Henctor Huilding to Drain Tiles Areund the Foundation of the HuiIding GontIemen follow-up on Reportable Occurrence No. 18, dated This 1"1ter is a August 6, 1993, the release of appro>.imately 7,500 gallons of low level radionetive wat er from a collectit.n tank (cold sump) in the basement of 1he Ford Nuclear Henctor building to drain tiles around the foundation of the building.
i Corrective Actice The 1ine from the foundation tile drains to the reactor cold sump, throue.h which the wat er was released, has been permanently sealed.
A leaking check valve in the cold sump discharge ]ine, which was the reason the nump was allowed to fill and ove rfl ow to the adjacent hot sump, has b"en replaced.
The cold sump has been returned to its norma 1 configuration.
The tile drain
.in4 was not shown in a n :, of the facility's training unteria]> or system descriptions.
A thorough survey of all exterior wal1s and f.i c a r s in the r" actor b u i l d i tu?; was conducted to identify all pipes l o n v i m/ the r" actor building.
No additional paths for radicact3v" 1 1. rj u i d s to lente the faci 1it3 and go direct 1y to ground have been found.
i compl"te set of building construction drawings has been :,rd e r"d for cross c hei:k i n g and ve ri fi ca t ion of the survey result 7.
Five campling wells were dug around
- t. h e react or building to monitor for radioactivat; in the ground water.
Ground water was struck approx imat el y 30 feet below the surface.
The r eac t or basement floor where the cold sump is located is approximately 15 feet below the surface.
No radioactivity has been d"tected in any of the wells except in th" well located near the southeast corner of the reactor IuiIding; ihis i s the 1ocalion near"st the drain ti1e pipe.
Jn that 11, no gamma activity from non-naturu] sources was detected.
'Irltium was detected, w
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g United States Nuclear Regulatory Commission October 6, 1993 Sampfing of the wells was first conducted on August 12, 1993, immediatei: after the wells were dug.
The level of tritium in the 2.o u t h e a s t corne r wel I was approximatel seven percent of the maximum pernissible concentration to the unrestricted area ( MPCr ).
Sample
.neasurements made after the initial measurement have shown a tritium buildup to between 80 and 90 % MPC followed by a gradual decrease in tritium to t.he most recently measured level of 62 % MPCc on October 1.
1993.
Monitorins the wells will continue.
The reac1or faci 1it' wi1] conduct a pathway analysis to determine t he pot antini impact of the release.
Two pieces of computer so f t ware ha ce been ordered from the Energy Science and Technology Software C"nter (1) RESRAD, site specific guidelines for a l l owabl e residual concentrations of radionuclides an soil, written by C.
Yu, Arconne *ational Laboratory, and (2) GKSCREEN 2.01, assessment of th" groundwater pathway from leaching of radioactive substances from surface und buried sources, written by A.
S.
Hood, Idaho Natinnal f.n c i ne e r i ng Laboratory.
Geological and groundwater informat'on will be cathered from the University of Michigan's Geological Scir v es
- t nd Civil Engineering Departmonts with the particular assist e e of Professor llenry Pollach in the Geological Sciences Department.
Prof"ssor James Martin of the School of Public Health and a member of the reactor's $nfet: Review Committee has agreed to provide a s s i s t ar.c e in the analysis.
Stucereil', /')
/1 tm4 Ronald F.
Fleming D: re tor sc Fr. Home:
N"a!,
\\ ice President for Research Sa f e t: Rev2ew Jommittee Members R, actor Operation Staff t!nited State Nuclear Regulatory Commission Document Control Desk ittn: Theodore S.
Michaels, Project Mar.a g e r Standardtration and Non-Power Reactor Proje"t Directorate Division of Reactor Projec t s III,
]V, V,
and Special Projects aff!ce of sueleir Reactor Regulation Washington, D.C.
20aaa tinate-d 5tates Nuclear Regulatory Commission 4
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McCormick-barger Subscribcd and sworn before me, this ')
799 Hoosevelt Road day of CCMe 193 a Notary PubHc Glen Ellyn, 111inois 60137 in and for C<~2M-~ m Cou nty, Mich:;;an.
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<svutme; NOTARY PUBLIC Page 2 My Comm:ssion expires N O 193_7
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