ML19241C053
| ML19241C053 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/03/1979 |
| From: | Butler W Office of Nuclear Reactor Regulation |
| To: | Tedesco R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7907260483 | |
| Download: ML19241C053 (5) | |
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S, UNITED STATES NUCLEAR REGULATCRY COMMISSION f j.
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WASHINGTCN, D. C. 20555
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.UY 3 737g ME' " MOUM FOR:
R. L. Ted.sco, Assistant Director for Reacter Safety, DSS FL:t :
W. R. Butler, Chief, Containment Systems Sranch, DSS
SUBJECT:
RESULTS CF SUR'/EY OF TYPICAL OL APPLICATIONS RE: HYDROGEN INSTRUMENTATION The puroose of this memorandum is to respond to your request ccncerning the status of H instrumentation for typical CL applications under current 2
rev1ew.
Specifically, the task was to detemine for representative Babcock and Wilccx, Ccebustion Engineering, Westinghcuse and General Electric pcwer plants currently under OL review the following:
a.
Is hydrogen concentration in the containment atmosphere measured?
If hydrogen concentration is measured, is it done continuously v.
or by grab samples; c.
For continucus hydrogen measurement, are the instruments safety grade, and where is the readout panel located?
d.
For grab sample measurement, is the system designed to accomodate the associated high radiation levels in the containment atmciphere in terms of per3onnel access to the sampling location?
The enclosed table titled'" Hydrogen Instrumentation Survey for Typical Current CL Applications" provides the available answers to these questions.
The table indicates that in all of the plants surveyed the hydrogen concentration is measured on a continuous basis, except in the case of McGuire where the hydrogen concentration is by grab samples.
For continuous hydrogen measurement, the instrumentation is safety grade, except for the Waterford 3 plant which is nonsafety grade and remains an open issue in our licensing review.
Contact:
L. Ruth, CSB 492-7711 790726048s S49222 f
MAY a ISTS R. Tedesco With regard to the high radiaticn protection for McGuire's grab sample system, the SAR does not specify any access protection for TIO source release.
The Plant Systems Branch is conducting a similar survey for all operating plants; the results will be presented in a tabular format. This table will give a brief description of the hydrogen monitoring system, the associated technical specification, safety grade status and the types of recombiners and purge systems used. The results of this survey will be available in the near future.
It should be noted that our general survey taken for current CL applications is based on the limited and of ten vague information provided in the SARs.
If more detailed information is recuired, a list of questions in the subject area will have to be prepared so that the information can be obtained from the applicants / licensees.
4 dd t-U Walter R. Butler, Chief Centainment Systems Branch Division of Systems Safety
Enclosure:
As stated cc:
G. Lainas J. Kudrick C. Grimes F. Chang L. Ruth R. Mattson V. Stello R. Vollmer fi4S223
Page 1 Ilydrogen Instrumentation Survey for Typical Current OL Applications i '=nt Type of is 11 Continuous Or for Cont. Heasure-Is High Radiation i
Considered Recombiner Conc $ntration Grab Sample ment is Instru.
Protection Provider Measured?
Heasurement Safety Grade?
for Grab Sample?
Location of Readout Panel i
Byron /Braidwood AI External Yes (only when Continuous when Safety grade, local fl/A
- Westinghouse -
Recombiner recombiner fans reccmbiner readout at recom-(At Q-1 Stage) opera ting) operating bin <'r, main control (Temporary shieldin I
room seadaut for access to implied in SAR recombiner is provided).
Watts Bar
,:,tinghouse Yes Continuous Sa fety grade, fl/A
- Westinghouse -
Internal Recombiner monitored and a
(At Q-2 Stage) opera ted f rom main l
control room licGuire tiestinghouse Yes Grab Sample fl/A for sample system
- tiestinghouse -
Internal the SAR does not (SER Issued)
Pecombiner specify TID source release protection.
SAR states recombiner control b
panel in electrical
(
penetration room in area accessible following LOCA.
Page 2 ilydrogen Instrumentation Survey for Typical Cu, cent OL Applications Plant lype of Is ll Contineous Or For Cont. Haasure-
!s liigh Radiation Considered Reconbiner Conc $ntration Grab Sample ment is Instru.
Protection Providet Heasured?
Heasurenmnt Safety Grade?
for Grab Sample?
Location of Readout Panel Bellefonte Westinghouse Yes Continuous Safety Grade N/A
- Babcock &
Internal Within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Wilcox -
Recombiner of LOJA (Delayed Review)
Reconibiner control in main control room.
Midland Westinghouse Yes Continuous Safety grade, N/A
- Babcock &
Internal readout and alanns Wilcox -
ilecombiner in main control (Drt.ft SAR) room San Onofre 2 & 3 Westinghouse Yes Continuous Safety grade, N/A
- Conhustion Internal remote readout Engineerin Recombiner nlanns and controls (Draft SER) g -
In main control rocm CF
$m FL NN C/1 i
i j
Page 3 Ilydrogen instrumentation Survey for Typical Current OL Applications l
1 plant Type of Is 11 Continuous Or For Cont. Measure-Is liigh Radiation Considered Reconbiner Conc $ntration Grab Sample ment is Instru.
Protection Provided Measured?
iteasurement Safety Grade?
for Grab Sample?
Location of Readout Panel Waterford-3 Westinghouse Yes Continuous flonsafety drade N/A
- Combustion Internal (open issue) remote Engineering -
Recombiner station in main i
control room.
Main panel in auxillary building i
Shoreham AI Yes Continuous Safety grrrie, (Analyzed
- General External Recombiner 2 locations in readout in main automatically Electric -
drywell controi room without need of 2 locations in operator) wetwell Zinner GE External Yes Contiriuous Safety grade, (Remotely taken
- General Recombiner 2 locations in Au toma tically ceadcut in control without need of Electric drywell taken on isolation roo.n operator) 2 locations in signals wetwell V1 CD NN CD i