ML17252A022

Summary of Meeting with Commonwealth Edison Company, Nebraska Public Power District Regarding Air Containment Atmosphere Dilution Hydrogen Control Systems for the Above Facilities on Dresden, Units 2 and 3, Quad Cities, Units 1 and 2, Coope

ML17252A022
Person / Time
Site:	Dresden
Issue date:	05/20/1976
From:	Fletcher M Office of Nuclear Reactor Regulation
To:
References
Download: ML17252A022 (8)

Text

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UNITED STATES A NUCLEAR REGULATORY COMMIS~N WASHINGTON, 0. C. 20555 Mm' z n1976 DOCKET NOS. : 50-237, ~50-254, 50-265, 50-298 LICENSEES: COf.11-'fol,ll.JEALTH EDISON COMPANY, NEBRASKA PUBLIC POWER DISTRICT FACILITIES: DRESDEN UNITS 2 AND 3, QUAD CITIES UNI'l'S 1 AND 2, COOPER l\Tl.JCLEAR STATION SUN?.,lARY OF H.EETING REGAR.Dii\G THE AIR CONTAIN?*1ENT ATHOSPHERE DILUTIO~~

(ACAD) HYDROGEN cor,iTROL SYSTEHS FOR THE ABOVE FACILITIES On April 22, 1976, representatives of the Cor~onwealth Edison Company (CECo), Nebraska Public Power District (NPPD), Sargent and Lundy, Energy Incorporated (EI) and General Electric Company (GE) met with the Regulatory staff to discuss questions relating to the installation of ACAD and Contaim1ent Atmosphere :Monitoring (CAM) systems at Dresden Units 2 and 3, Quad Cities Units 1 and 2, and Cooper Nuclear Station.

Enclosure 1 is a list of meeting attendees. Enclosures 2 and 3 arc questions resulting from preliminary review b~ C. Grimes and J, Knight (DOR-OT) of the CECo ACAfJ submitt;:il. The purpose of the* meeting was to discuss the answers to the questions in enclosures 2 and 3.

Summary P. Bieniarz, o~ Energy Incorpor~ted (EI), consultant to CECo and NPPD for ACAD design analysis, provided answers to questions 9, 11, 12, and 13 of enclosure 2. Methods at calibrating flow measuring devices were discussed. It was agreed that both CECo and NPPD devices would be calibrated to indicate flow rates for gases at standard temperature and pressure (STP). Hr. Bieniarz stated that flow rates in his analysis were for gases at STP.

The NRC staff agreed to clarify its position on implement~ng paragr2ph II.12 of Standard Review Plan 6.2.5 concerning backup purge requirements.

The licensees described their respective CAN systems including bases for selection of* sensing locations .. F. Rudek, GE Space Division, described the new ?latinum-Electrochemical hydrogen detection system that CECo will use. The NRC staff asked CECo to submit additional information on the accuracy, qualif.ication tests, calibration techniques, halide poisoning characteristics, and de::;ign life of the system. CECo agreed to ~rovide this information. NPFJ intends to modify the existing I

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l hydrogen detection syatem at Cooper Station for use aB the CA11 system *

• . The NRC may have to re-evaluate the Cooper hydrogen monitoring system in light of its being used as a safety system.

ACAD system design and operation were discussed. NPPD agreed to submit performance curves for their AC.AD compressors. CECo has not yet

• procured compressors so perfo~nce curves will be provided later.

During discussion of question 8 of enclosure 2, it became apparent that CECo and EI were not in agreer:i.ent on ACAD operating procedures.

The NRC staff asked CECo to clarify its intentions so that an orderly review of its ACAD. submittal might continue. CECo agreed to do this.

In the course of answering questions 13 throu8h 16 of enclosure 3, lI CECo agreed to submit additional data regarding design criteria and single failure analysis of instrullientation and control 9ystems and isolation valve pilot sol~noids, a description of the Instrument Air system, nnd physical sepnration of instrumentation and control cables for the Cl\11 and AC1ill systems.

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Hichael 11*. Fletcher

• Operating Reactors Branch 02 Division of Operating Reactors

Enclosures:

DISTRIBUTION:

1. Attendance List *Docket (5)

2. Questions NRC PDRs

3. Questions Local PDRs 'I NRR Reading ORB-2 Reading MNFletcher

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1 Form AEC-318 (Rey. 9*53) AECM 0.<40

• U. 9. GOVERNMENT PRINTJNQ OFFICEI 1974-6%8*1615

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> ** e ENCLOSURE NO. 1 ATTJJ:IDA.i.~.CE LIST COMHONWF.ALTH EDISON COMPAHY G. Abrell

• R. T. Steen C. A. Lindberg NEBRASKA PUBLIC POWER DISTRICT T. E. Kissam J. M. Pilant R. E. Wilbur 1

GE - SPACE DIVISION F. Rudek SARGENT & LUNDY F. Tsai.

w. J. Robinson.

ENERGY INCORl'ORATh:D P. B. Bieniarz NRC - STAFF R. P. Snai.der M. H. Fletcher J. Slider

c. Grimes J. E. Knight

c. W. Thayer OFFICE~*

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• Oesc~ibe in more detail the dest~n ~n~ principl~*of operation of the hydrogen detectors. Provide a sketch *.

2~ What periodic .calibration is to be pe~forrned to assure a correct read-In~ wh~n needed? .. *

3. *Are there any poss i b 1e pa 1 Ja::tium poi son ing mechan i $ms. at th~ detector 1ocations7 . . *-- .. -- *. .

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What are the effects of radiat.ion .(expected during a LOCA) on the out-put of the hydrogen detection system? *

6. What is the accuracy of the calibration gas?

7. What is the accuracy of the hydrogen detection system with the sensor elevated to the LOCA temperature?

8. Describe the installation details of the hydrogen detector that assures that the calibration gas is not diluted during the calibration.

9. Describe the qualification tests performed on the hydrogen detectors which qualify them for a LOCA environment.

10. Is it *possible for the detectors located in the suppression cha~ber to be irr*nerscd in water at any time during a LOCA and if so what effect does this have on th~ output?

11. Provide logic diagrams for the.control systems.

12. The drawings appear to be incorrect for the flow control valves for both the air injection and venting systems. Explain the purpcse of the iir supply which is applied directly to the solenoid valve and give the controlled valve position for loss of ~ir ~nd lo~£ of electrical power.

Describe the power train assignment to instrumentation, i:ontrol system, an~ isolation valve pilot solenoids.

Describe the air supply system to the control and. isolation valves.

Describe the criteria employed in the 'design i.e. Codes, Standards, Reg Guides etc. To whJch these systems are designed. *.

16. Describe the p~ysical separation fo~ electrical, instrumentation, irid

. control cables for the CAM & ACAD Syster.is *

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" e MEETING

SUMMARY

DISTRIBtrrION:

• Docket NRC PDR Local PDR ORB #2 Reading NRR Reading B. Rusche E. Case

v. Stello K. R. Goller D. Eisenhut T. J. Carter B* A. Purple G. E. Lear R. w. Reid L. c. Shao R.* L.

• Baer A. Schwencer B. K. Grimes Project Manager - R. Silver, P. o** Connor, M.- Fletcher OELD OI&E (3)

RMD.iggs R. Fraley, ACRS (16)

T. B. Abernathy J. R. Buchanan NRC

Participants:

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