ML19220A921
| ML19220A921 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/29/1969 |
| From: | Racquel Powell US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Boyd R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 7904250096 | |
| Download: ML19220A921 (4) | |
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MAY se 1559 Roger S. Boyd, Assistant Director for Reactor Projects, D1L
,,ed bv I~d23:
- 1. L. Tedesco, Chief, leactor Project 3 ranch 2, ORL Robert L. Tens $
MZZTINC VITH JIISET CEST2AL POWER & LIG'l? COMPANT AND. WET 20 POLITE EDISCN COMPA3T (TE2EZ MILE ISLAND UNIT 2) DCCZIT !io. 50-320 An infor=ation meeting was held with representatives of Jersey Central-
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Power & Light Cow (JCPL) and Metropolitan Edison Company (Met-Ed) on May 13, 1969 in Bethesda. 'lhe purpose of this meeting was to obtain additional information regaraing control rod drive and emer-gency power systems for the Three Mile Island Unit No. 2 (TMI #2).
Ihe meeting attenance liat is attached.
Control 2od Drive (Control Circuits)
Babcock & Wilcox (Z&W) gave a presentation of the control circuits which will be used in the TMI #2 control rod drive smten. As part of the development of specificatiors for the con.xol rod electrical system, 3&W is performing vibration tests using a shakar table to determine the rescr. ant frequency of components. The results will be used to provide necessary information regarding Class I seismic design requirements.
Iha electrical system used to drive the control rods initiates con-trol rod motion using synchronous stepping motors. One step move-ment rssults in a vertical motion of the control rod of 1/32" per pulse. Rod action is accomplished by energizing, in proper sequence, two and three windings of the motor stator windings.
Transmission of a demand motion signal is provided by a progr smer disc using a light and photo-cell arrangammt. The photo-cell circuits, in turn, operata solid stata circuitry. Representatives of the Instrumentatien & Forer Technology Branch (I&PT3) suggested that R&W should: (a) consider developing life test crpectancy data for the? light and photo-es11s used in the pulse programmer, and (b) review the possibility of rapid rod motion resulting from a chante in frequency to the motor driving the p%
er disc The frequency source is an inverter wbse failure modes with respect to frequency chamres have not been analyzed.
B&7 indicated testing performed during the life test for the control rod drive system consisted of an equivalency of approwntely 500 scrans and more than 100,000 feet of rod motion.
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Eoger S. Boyd gjy 3 g ggg position indication systen,which reliss on the stepping pulses to provide the control red position, did not skip any pulses throughout the lif e test of the control rod drive.
B&W has perferned tests to determine eff ect of energizing various combinations of the notor stator vindings to detersf ne the eff ects en rod notion. Most cos51 nations, other than those intendad, will produce a trip. 34W is continuing these tests to assure that to combination can result in rapid notion to the co strol red.
34W also presented a description of its new scra:t bus design occasioned by the changes in their control rod systen.
I&P 3 dis-cussed various portions of the circuits in terns of redundancy and tes ubility. An error in Figure 3-70 in the PSAR vas brought to cur attantion. A corrected version vill be submitted.
A copy of the charts used in the presentation was gi*en informally for reference purpose to I&PT3.
B&W indicated that a topical report covering results of control red drive research and development vill be subsitted to DRI. belora July 1969. Tha copical report will cover primarily the mechanical aspects of the control rod drive.
Onsite Esergency Power System A briaf description of the ensita energency power system was given by the architect-engineer, Burns & Roe (3&R). B&R did not indicate if a failure analysis of the circuitry for onsite energency power had been performed. I&PT3 requested that the applicant submit in the next --aA-t (Amendment No.10) a statenent that the onsite emergency power design for the W. #2 will meet the single failure
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critarien.
3&R indicatad thae becausa thw diasa1 building foundation vill be based on bedrock, only a =m11 portion of the building would be located above grousd 1svel. This change has required the location of the diesel fuel storage tank to be changed to the side of the building instead of belcw the floor as indicated in the PSAR. Such action also provides some protaction against missile damage.
Primary Coolant Puse 71vvheel "Je discussed the safety aspects of pump flywheels. 3&W intends to submit the evaluation in Awmdment No.10.
We cemmented on a draft I'
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_3 versten of the evaluatics indicating that it was lacking in the area of flywheel fabrication inapection. E&W indicated that they vculd chech with the manufacturer regarding cur ecucern and coc:ments.
Acticn Items The following action items are necessary as a result of the meeting:
1.
Statemant in A=endmenc 10 indicating that the design criteria for ensita emergency pcver systea vill include protecticn against effects of single failures.
2.
Correct Figure 3.70 in FSAR.
3.
Design critetia regarding the pump fivvheels vill be included in Amandsent 10.
f f/non Y I OW Y Rayrond R. Powelf Raactor Project 31 Anch 2 Division of Reactor Licensing Attachment s List of Attendees cc:
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