ML20245E889
| ML20245E889 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 01/23/1989 |
| From: | Trzyna G COMMONWEALTH EDISON CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| 5509K, NUDOCS 8901260266 | |
| Download: ML20245E889 (2) | |
Text
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a Commonw:alth Edison d
One First National Plaza. Chicago, lilinois
[.s Address Reply to: Post Othee Box 767 Chicago, lilinois 60690 January 23, 1989 Director of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mall Station PI-137 Washington, D.C.
20555 Subjecti Zion Nuclear Power Station, Units 1 and 2 i
NRC Docket Nos. DPR-39 and DPR-48 License Nos. 50-295 and 50-304 Stntus of DCRDR i
Gentlemen:
Zion Station is in the process of addressing the commitments that were made to correct human factor design deficiencies that were identified as a result of the Detailed Control Room Design Review (DCRDR).
Corrective actions were developed for the various Human Engineering Deficiencies (HED) and the HED's were scheduled to be addressed during two distinct refueling outages.
Zion has completed the HED's associated with each of the first refueling outages for both Units 1 and 2 with one exception. The intention of this letter is to describe the details of the exception and to confirm a telephone conversation between J. Norris and other NRC Staff personnel and G.
Trzyna of Commonwealth Edison regarding the resolution of this matter.
Several HED's were initiated to correct the inadequacy of the recorders associated with the radiation monitoring system.
A modification to replace the multipoint recorders was developed to collectively address the HED's associated with this component.
This modification was initiated on Unit 1 in 1987 and was scheduled to be performed on Unit 2 during the Fall, 1988 j
outage.
Subsequent to the Unit 1 installation of the modification, a human factors review was performed which concluded that the newly installed recorders were still inadequate even though they addressed the required HED's and in fact, had potentially generated new HED's.
In light of this evaluation, Zion Station requested a relief from the 12/31/88 completion date for HED 188 for Unit 2.
This HED addressed the fact that the numerals on the recorder point displays had been worn making it difficult to distinguish the various points.
The NRC was made aware of the problem and agreed that it would not be prudent to install recorders that potentially create additional HED's anC verba13y granted a relief from the 12/31/88 commitment.
i In the interim, Zion Station has enhanced the existing radiation monitor recorders for Unit 2 to make them as legible as possible.
All release point monitors ar e being recorded on continuous pen recorders.
Wherever possible, the use of multipoint recorders has been modified to record a single parameter thereby alleviating the confusion regarding the distinction of data points. Work requests have been issued to ensure that the remaining recorders correctly inking and printing to make them as legible as possible.
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,s A new replacement recorder has been evaluated by Human Factors personnel and appears to adequately address the HED's without creating additional HED's.
This recorder will be used to replace the necessary recorders for Unit 2.
A comparable recorder will be selected for Unit 1 to accomodate the physical limitations of the Control Room radiation monitoring consoles.
Also, a modification will install a Radiation Monitor Display Syster, which will provide a computer display of the data point for the Control Room operator thereby reducing the reliance on the recorder. This installation is scheduled for the Unit 1, Fall 1989 and Unit 2, 1990 refueling outages.
1 1
Please address any questions that you may have to this off2ce.
Very truly yours, 1
f
}Gt) 9 1
Glenn Trzyna l
Nuclear Licensing A&ninistrator Zion Station t
rf cc:
C. Patel - NRR L.
Peterson - Zion R. Greaves - Zion 5509K l
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o ZION NUCLEAR P0HER STATIQH DETAILED CONTROL ROOM DESIGN REVIEH ATTACHMENT 7 l-ORIGULALRADIAILOMJiONIIOR RECQRRER_HED'S_AliD_ AN EVALUATION OF Tile IMPACT Of DEFER 3&L l'
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Zion Corrective Action HED No.: 0409.0Z&6 GUIDELINE: R L L2H R-2. 5.4.E.B.3/05-2 CATEGORY:
2 LEVEL B
flBD1 NGL Chart paper for multi-point recorders on CB14 and CB73 advance at such a slow rate that the plotted points are not clearly printed on the paper and are difficult to read.
(Photo Log No. G-16, I-34).
RESEQNSE1 The cited recorders will be replaced with more state-of-the-art recorders which print clearer.
ELA.LDAIIDtil These HED's identified the difficulty in reading the multi-point recorders due to the slow rate of advancement of the chart paper.
They were identified as CATEGORY 2, LEVEL B indicating moderate, but not significant impact on the efficient operation of the plant.
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1 JMPLEMENIaIIQN:
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By the completion of the second refueling outage.
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Zion Corrective Action HED No.: OlM GUIDELINE:
5.4.2.B.3-1 CATEGORY:
2 LEVEL B
j DINDING1 The number printing mechanism on discrete recorders does not provide clear
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sharp numbering on the graph paper. While there is some problem with the j
i numerals not being printed clearly themselves, the primary problem is that they are being printed on top of one another due to the slow movement of the paper.
RESPQME.1 The cited recorders will be replaced with more : tate-of-the-art recorders which print more clearly.
EVALUATION _OF IMPACLOLDIELRRAL This HED identified a problem with multi-point recorders in that the number printing mechanism caused the numbers to print on top of each other, making them difficult to read.
This HED was identified as CATEGORY 2, LEVEL B indicating moderate, but not significant impact on the efficient operation of the plant.
LM_P_LEMENTAl10N:
By the completion of the second refueling outage.
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,.,. v Zion Corrective Action HED No.- Q28L_0J3fL_Ql88. 0151. 0367 (Note;_. BED _jjlf} is the_pnly requg1Lfor deferrall GUIDELINE:
1.1.1.B/05-1. 5.4.1.H-1. 5.4.2.B 2-1. 8.1.1.B-5. 8.1.1.B/VR-23 CATEGORY:
1 LEVEL A
l f3RDING1 It was reported in the operator survey that a status panel of radiation monitoring meters is needed in the primary operating area.
Presently, these monitors are located on the back panels..Specifically, the four radiation i
I monitcring recorders (on CB73) would be more appropriately placed in the main operating area.
In addition, the numerals on the point displays for four of the recorders have rubbed off so that the point being monitored cannot be j
determined.
(Photo log No. C-5 through 8, G-15, H-16, 17)
RESP _QNSf1 3
A Ramtek computer will be added to the primary operating area to display all l
critical radiation monitoring parameters.
Due to the time required for the coordination, design, and procurement of equipment for this modification, it will be completed by the third refueling outage.
EyVALUATION OF IMPACT OF DEFERR&L i
This HED identified a problem with reading multi-point recorders due to rubbed l
off numerals.
This HED was identified as CATEGORY 1 LEVEL A indicating that it dealt with engineered safeguard systems or engineered safety features and has significant impact on plant safety and/or productivity.
Deferral of the replacement of the multi-point recorders is justified due to the fact that the j
recorders that were installed are an improvement, but can be further improved upon. Addit' Anally, the installation of a microprocessor based Radiation Monitor Display System (RMDS) will reduce the necessity of the operator's dependence on thee multi-point recorders.
i JMFLEtiENTATION:
i By the completion of the second refueling outage.
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