ML17083B347

Discusses Estimate of Radiation Exposure Levels Expected at Low Power,Per Request Re Expected Exposure During Plant Walkdown to Inspect Seismic Provisions

ML17083B347
Person / Time
Site:	Diablo Canyon
Issue date:	04/05/1984
From:	Congel F Office of Nuclear Reactor Regulation
To:	Vollmer R Office of Nuclear Reactor Regulation
Shared Package
ML16340E340	List: ML16340E339 ML17083B347 ML17083B354
References
NUDOCS 8404180089
Download: ML17083B347 (4)

Text

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Vy 4 y*~4 MEMORANDUM FOR:

Qel>ED STATES CLEAR R EG ULATORY COMMISSI WASHINGTON, D. C. 20555 Richard Vollmer, Director Division of Encineering APR g

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Enclosure 3

SUBJECT:

(1) The 'inspection will begin at least 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> following the first plant shut down from not more than lOX reactor power operation, (2)

The inspection will be conducted in compliance with ALARA policy, (3)

One person will be exposed to radiation, (4) Fuel assemblies in the core will be essentially leak free, arid (5) Inspection will exclude the vicinity of reactor vessel cavity.

FROM:

Frank J. Congel, Chief Radiological Assessment

Branch, DSI DIABLO CANYON RADIATION EXPOSURE LEVELS EXPECTED AT LOW POWER f

RAB has provided estimates of radiation exposure levels. in reply to your request for an estimate of expected personnel radiation exposure during Diablo Canyon plant walk down to inspect seismic provisions for adequancy.

Our estimates

..were based on the following assumptions:

Data and experiences gained previously from other facilities during similar conditions were adjusted to this particulyr case.

The results show that average radiation levels in the vicinity 'of most seismically affected piping at Diablo Canyon should be less than 1 mRem/hr.

Thus, assuming per-sonnel exposure time of -10 hours,the average personnel exposure should be approximately 10 mRem.

Higher personnel exposure could be expected in the case that reactor water cleanup system was.in operation during lOX reactor power (one or two days long) operation.

Radiation fields in the vicinity of the cleanup system components could reach in such case, the Rihr range.

Thus, in this case a total personnel exposure of approximately 100-200 mRem could be ex-pected.

Frank J. Congel, Chief Radiologica',

Assessment Branch Division of Systems Integration cc:

. Hattson

0. Huller

0. Lynch F.

Skopec

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