ML19347F195
| ML19347F195 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/17/1981 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML19347F188 | List: |
| References | |
| NUREG-0752, NUREG-0752-S01, NUREG-752, NUREG-752-S1, NUDOCS 8105150441 | |
| Download: ML19347F195 (17) | |
Text
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O Nusea-07s2 g
Supp. No'.1 e
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Contro Room Jesign Review Rec' ort Tor iV s
e Metropolitan Edison Company, et al.
5 Three Mile Island Nuclear Station Unit 1 Docket 50-289 o
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Contro Room Jesign Review 9eaort or - V l-1 Metropclitan Edison Company, et al.
Three Mile Island Nuclear Station Unit 1 Docket 50-289 i
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Mant.scr:ct 0:n cieted: A:ril 1981 Cate P;::;'s ec: A:ril 1981 l
Division of Human Factors Safety Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555
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TABLE OF C0f!TE?iTS A.
Introduction 1
C.
Deficiencies Identified in the Control Room Design Review 1 Deficiencies to be Corrected Prior to Restart 1
0.
Cenclusions 15 Acpendix I - References
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4 HUMAN FACTORS ENGINEERING BRANCH h
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tT CONTROL RO0li DESIGN REVIE'.4 (CRDR) REPORT SUPPLEMENT 1 A.
Introcuction After cur Control Room Design Review Report, !!UREG-0752,E was issued, the licensee responded to that document in a letterb dated January 21, 1981. The licensee's letter documents the actions that it intends to take in response to NUREG-0752 prior to restart and takes exceotion to several staff requirements. 'eli tn the exception of eignt scecific and one general item, tne appli-cant will imolement all of the requirements of NUREG-0752. The following paragrapns identify the sections of MUREG-0752 to which the licensee takes exception, the. licensee's new proposal, and the HFEB position.
C.
Deficiencies Identified in the Control Room Desien Review Deficiencies to be Corrected Prior to Restart NUREG-0752 Position:
SECTION 3 CONTROLS (GENERAL) e.
Legend indicators contain numerous burned out bulbs. A fonnal surveillance program will be implemented to detect and replace burned out indicator lamps for panels which do not have a lasp test capability.
Final resolution of this deficiency will be addressed in the licensee's DCRDR report.E
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LICENSEE PROPOSAL:
-Section 3.e discusses burned out bulbs in legend indicators.
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Currently bulbs that are normally lit are checked on a daily basis. For those bulbs which are not normally lit in the L
- Engineered Safeguards (ES) and Emergency Feedwater (EFW) systems, surveillance procedures will be modified to check indicators when j
- the status of the comoonent is changed during the test. During l'
the biannual review of tech. ' spec surveillance procedures for other systems, they will be modified to check light operation..
HFE3 POSITION:
Based on our evaluation of the licensees proposal, we find the licensee's proposal for checking legend indicator lamps acceptable for restart. However, we require that the licensee investigate systems and techniques for effective communication of indic:;or and disolay lamp status information to operators where " push-to-test" lamp status information is not already available and report its findings and proposals in its one-year detailed control rocm design review report (DCRDR).2/ The licensee has not committed to meeting
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l-this ravised requirement.
l NUREG-0752 Position:
d.
Legend switch covers are interchangeable.
The licensee will implement a orogram either through administrative or operating procedures, to lessen the possibility or interchanging switch covers. Final resolution i
. of this deficiency will be addressed in the licensee's DCRDR report.E LICENSEE PRCPOSAL:
Section 3.d addresses the intercnangeability of legend switch covers. flew labeling will be added to the panel vice changing administrative or operating procedures to ensure that switch covers are returned to the procer location.
HFE3 POSITI0ft:
We accept as a final solution the licensee's proposal to add new labeling to the panel in lieu of changing cdministrative or operating procedures to lessen the possibility of interchanging legend switch covers. The licensee has committed to perform this action prior to restart.
LICENSEE GENERAL Ey.CEPTI0ti:
fluREG-0752 Position:
b,d,g - The licensee discussed their earlier res::onse to items 3.0.b, 3.0.d, and 3.0.g.
We accepted the licensee's prooosal for final resolution of item 3.0.d above.
With regard to items 3.0.b and 3.0.g; b.
Set point knobs on Bailey controllers do not lock, and can be accidently rotated.
The licensee will emphasize during operator training and retraining the need to frequently check controller set point knob settings. Final resolution of this deficiency will be addressed in the licensee's DCRDR report.E
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Bailey controllers indicated demand signal rather than valve
. posi tion. ' (3. h) 5_/
The licinsee will emphasize during operator training and retraining that controller indicators display the controller i
demand signal, rather than actual valve position.
In addition.
the licensee will improve labeling of the controllers, the imeter selector switches, and certain controller meter scales.
i Final resolution of this deficiency will be addressed in the licensee's DCRDR report.E Emergency feedwater flow meters will be installed in the immediate vicinity of the controllers, and, near backur. aanual controllers, which vill be added.
LICENSEE PROPOSAL:
With specific reference to Section 3.b 3.d, and 3 9. however, we believe that the snort term corrective actions addressed in 8
Met-Ed/GPU letter TLL 559 / dated November 7,1980 to 9. u. Reid frun H. D. Hukill, is fully adequate and we presently plan no additional actions relati::d to these specific findings.
HFEB POSITION:
We have accepted the licensee's proposal for correcting the deficiency i
noted under paragraph 3.d.
We have no immediate or long range requirements for licensee actions concerning items 3.b and 3.g.
However, we require that the licensee include these items in.its
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., agenda for conducting and report on its DCRDR1/. The licensee has not as yet committed to addressing items 3.b and 3.g in its 1#
DCROR The licensee also discussed recocrended actions developed from its GPU Cesign Review Report, "A Review of the Three tiile Island Unit 1 Control Room from a Human Factors Viewpoint" dated -
December 1980.1/ The licensee informed us that this is GPU's CCRDR recort, whicn is not required for licensing review prior to T:il-1 restart.
SECTION 4.0 DISPLAYS (GENERAL) c.
llormal operating ranges or set points are not indicated on vertical meters.
Normal operating ranges or set points will be indicated on meters which have safety significance, where nomal range / set point information can be identified.
LICE'ISEE PROPOSAL:
Secticn 2.c recommends placing nomal opvating ranges or setpoints en vertical meters.
In order to clarify the issue, only instruments witn well defined operating ranges and setpoints will be marked.
H:ES POSITION:
We believe the licensee has properly interpreted the intent of this requircinent as stated under Section 4.0.c of NUREG-0752.
Tanporary markings for normal operating ranges may be used on an interim basis for restart until firm ocerating range information
. is established. Ne require tnat markings of the final operating ranges be permanently installed by the end of the first refueling outage. This requirement has been modified. The licensee has not as yet committed to cerforming the long-term action.
SECTI0tl 7.0 SOUt!D LEVELS b.
Main control board alarm is below ambient noise level.
c.
Panel Left (PL) alarm is only 1 dbA above ambient noise level.
d.
Rignt Panel Front-(RPF) alarm is only 1 dbA above ambient noise' level.
e.
Liquid Waste System alar.1s below the ambient noise level.
The alam levels for the main control board, panel left, right panel front, and the liquid staste system alarms will be adjusted so that they will be from 6 to 10 dbA above the ambient noise.
LI'CEN3EE PROPOSAL:
Sections 7.b through 7.e discuss alarm sound levels and state that they will be adjusted to obtain a level 5-10 dbA above the ambient noise.
It is our intent to perform tests on audible tones for individual alarm systems and to adjust these tones so that (1) each is clearly audible and distinguishable above normal control room background and (2) operators can communicate with each other while the tone is sounding.
It is expected that this will result in individual
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tones.being set at a level of.6-10 dbA above the ancient noise in a one octave band. Ne believe this meets the intent of the Comission's requirements.
HFE3 POSITION:
We find that the licensee has correctly interpreted the intent of I
L-our requirements stated under Section 7.0.b through 7.0.e of NUREG-0752.
The licensee has committed to perform this action prior to restart.
SECTIO *1 9.0 REMOTE SHUTDOWN PANEL (RSP) l a.
The panel is not independent of t'le Control Room. All actions, i
other than the starting and stopping of RC ounps, at e recuired to be performed in the control room and local areas of the plant.
A newly designed remote shutdown panel and a revised emergency procedure using the new-panel for cool down oceration indepen-dent of the control room will be implemented.
l LICENSEE PROPOSAL:
Section 9.0.a states that "a newly designed remote shutdown panel...
will be implemented.' Work is presently underaay to design and procure the equipment associated with this panel. There appear to be, however, problems in obtaining this equipment on a schedule consistent with comoleting the modification prior to restart, which i
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plan 'on completing the; currently planned remote shutdown panel and its associated emergency lighting. This proposal will be discussed
'in gretter detail in a separate submittal.
HFE3 POSITION:
In addition to reviewing the licensee's January 21, 1981 letter
. roposal, we have also. reviewed the licensee's Unit 1 Emergency p
- Procedure, 1202-37, "Cooldown from Outside the Control Room"S/
and the licensee's " Initial Startup Report" dated November 26,197A.5/
By these documents, the ifcensee has demonstrated that the minimum shift complement of five men could bring the reactor to and maintain it in a safe hot shutdown condition frcm locations outside the control room. Based on our review of these documents, we conclude that the existing remote shutdown panel and emergency operating procedures provide adequate remote shutdown capability for restart.
However, in order to improve this cacability, we require implementation of a nevly designed remote shutdown canel and a revised emergency procedure for operating the new panel be completed by the end of the first refueling outage after restart. The licensee has committed to comply with this requirement.
NUREG-0752 Position:
c.
Communication from the RSP is by sound powered microphone with no microphone / headset located in the area.
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' A sound powered microphone / headset will be permanently. avail-able at the remote shutdown panel. To provide additional communications capability available.in the Technical Suoport Center (TSC),' keys to the TSC will be available in the control room, from the shift supervisor and from the person on duty.
responsible for the TSC.
LIC94SEE PROPOSAL:
Section 9.0.c states "a sound powered microphone / headset will be permanently available at the rerate-shutdown panel." A more detailed evaluation of the aopropriate comunication system for the remote shutdown panel has recently been oerformed. Modifications will' be made to this system so that it is indeoendent of both the control
' room and the rel ay room. We believe this meets the intent of the Comission's recuirements.
HFEB POSITI0ti:
'le -find the licensee's proposed action for implementing an improved communication system at the RSP acceptable. The licensee has committed to complete this action orior to restart.
SECTION 13.0 LIGHTING b.
Direct glare from overhead lights on both controls and displays make readability difficult.
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The licensee's ligh..ing survey indicated that normal control room lignting levels are consistent with recognized standards 1
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- s o_ _ (NIL-STD-147?SandIESLightingHandbook). Glare problems associated with normal lighting are discussed in paragraph.
a.b.
Emergency ligntiag levels will be increased where needed and light fixtures will be noved to positions that will assure adequate illumination of controls and displays. Also, light baffles or other means will be utilized where necessary to reduce direct glare caused oy the emergency lighting system.
LICENSEE PROPOSAL:
Section 13.b states -that "..
light fixtures w111 be moved..."
An evaluation will be made of the adequacy of the emergency lighting in the control rocm, but linht fixtures will be moved only if this is determined to be required. We believe this meets the intent of the Commission's requirements.
HFE3 POSITION:
We find that the licensee has correctly interpreted our intent for the need to move light fixtures to improve emergency lighting as stated under Section 13.b of MUREG-07S:.
The licensee has committed to correct all deficiencies associated with Section 13 b prior to restart.
SECTION 14.0
GENERAL COMMENT
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In-core thermocouples (te ) have been connected to the orocess s
comouter, a monitoring program (software) has been written and the system is in the checkout process. The acclicant's system I
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p contains 52 in-core thermocouples with readout range up to
_2300'F.
Themoccuple information will be disolayed on the i
Bailey computer console by use of a CRT, and hard copy printed on demand. A backup system display with a cacability for selective reaoing of a minimum of 16 operable thermocouples, 4 from each quadrant, all within a time. interval no greater than 6 minutes, powered from a power' source independent of l
the process comouter/CRTs will be required prior to restart.
(16.c)E LICENSEE PROPOSAL:
Section 14.c requires that a backup display system for selected in-con e thermocouples be installed prior to restart. This item will be addressed in our response to NURE3-0737, to be sent in the very near future. We currently have two different means of reading.
i-in-core thermoccuoles (computer readout and an operator using l
portable test equipment).
i HFEB POSITION:
i As indicated in Section 14.c' of MUREG-0752 above, we have found acceptable the licansee's primary in-core thermocouple readout system which will be installed and operating before TMI-l restart.
However, we find unacceptable the licensee's proposed backup, or i
second means for reading in-core thermoccupics, i.e., an operator using portable test equipment. We conclude that a better backup sy: tem is required because (i) of reliance on in-core temoerature infomation in the inadequate core cooling procedures, (2) a system e
, _ similar to the procosed backup system was shown to be inadequate during the TMI-2 accident, (3) the vintage of the present plant concuter raises luestions about the reliability of the infermation disolays, and (4) the poor-human factors interface of the pro-posed backup systen during stressful ocerating condi+4cns.
'ie require as a minimum, data logging or recording equipment displays capable of displaying the temperature information for a mininun of 16 operable thermocouples, 4 from each quadrant, on demand, in the control.rcom. A pcwer source independent of.the CRT power supplies shall be used to pcwer this equipment to assure independence and reliability of displays.
This system is required to be operational prior to escalation beyond 5 percent of rated power. This requirement is revised and the licensee has not yet committed to its implementation.
D.
CONCL'JSIONS:
Based on our control room design review, and our review of the licensee's submittals and other refercr.ced clarifying information, we conclude that with the correcticns reouired prior to restart and prior to escalation beyond 5 percent of rated pcwer, the potential for operator error leading to serious consequences as a result of. human factors considerations in the control room is sufficiently low to permit restart and full power operation of TMI-1. However, in several instances the licensee has not as yet committed to perform the HFEB reccmmended actions, which are summarized in the table below. The staff believes that comoliance
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.with the recomendations made herein should be made a condition of restart.
The Office of Inscection and Enforcement will. verify imolecentation of all corrective actions required prior to restart and prior to escalation beyond 5 percent of rated power.
Sufi"ARY OF HFEB REC 0ft1 ENDED ACTIOtIS' AND LICE:ISEE COPIT'1EtlTS Recuirement Licensee Commitment Licensee Commitment flot Required Before Item flo.
to Imolement to Implement Restart or 5% Power,
. Before Restart Befcre 5" Power But Licensee Has Comitted to do in the Longer Term 3e*
yes no 3d yes 3b no
-3g no a*
yes no c
7b,c,d '. e yes 9a yes 9c yes 14c-no
' Indicates items which require action before restart, and in the longer ter'n
--Indicates item is not a requirement P
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APPENDIX I-1 REFERENCES 1.
NUREG-0752, Control Room Design Review Report for'TMI-1, December 1980.
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Letter, H. D. Hukill, L Sirector TMI-l to R. = N. Reid, _ Chief,-0RB No. 4, dated January 21, 1981.
3.
Three Mile Island Nuclear Station, Unit No.1, Emergency Procedure 1202-37, Cooldown From Outside the Control Room Revision 13, dated May 21, 1380.
J.
Met. Ed. Ceccany. Three itile Island fluclear Station,-Unit 1, Initial Startuo Recort, November 25,197a.
5.
Item number contained in the HFEB 'Oraft CRDR Report transmitted to Mr. R. C. Arnold of "et. Ed. on Sectember 16, 1980.
6.
NUREG-3737, Clarification of TMI-l Action Plan Requirements, November 1980.
7.
Licensee / Applicant Detailed Control Room-Design Review required in connection.with flUREG-0737, Item I.D.l.
8.
Met'Ed/GPU letter, H.- D. Hukill to R. W. -Reid, dated November 7,1981.
(TLL 559).
9.
GPU Design leview Reoort, "A Review of the Three Mile Island Unit 2 Control Room From a Human Factors Viewpoint" December 1980.
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