ML20137B159
| ML20137B159 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 12/27/1985 |
| From: | Kingsley O MISSISSIPPI POWER & LIGHT CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| AECM-85-0367, AECM-85-367, TAC-60372, NUDOCS 8601150137 | |
| Download: ML20137B159 (4) | |
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CORRECTED COPY: TO ADD OMMITTED j APPLICATION FEE CHECK, THUS CHANGING l
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MISSISSIPPI POWER & LIGHT COMPANY j Helping Build Mississippi '
P. O. B O X 164 0, J A C K S O N, MIS SIS S t P PI 39215-1640 December 27, 1985 _
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O. D. KINGSLEY, J R.
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U. S. Nuclear Regulatory Commission Amc * - - //S'Z)--- - -
Office of Nuclear Reactor Regulation Date cf C' d _// a2 . ..__.
1 Washington, D. C. 20555 j Date Ch;ch E cM._[ /p/N_ l Attention: Mr. Harold R. Denton, Director Received Ey. _ _[. ____
Dear Mr. Denton:
SUBJECT:
Grand Gulf Nuclear Station i Unit 1 Docket No. 50-416 License No. NPF-29 File: 0260/0756/L-390.0 Proposed Amendment to the Operating License (PCOL-85/24)
AECM-85/0367 Mississippi Power & Light (MP&L) hereby requests by this submittal an amendment to License NPF-29 for Grand Gulf Nuclear Station (GGNS) Unit 1.
This proposed amendment modifies the License Condition requiring resolution of the hydrogen control issue prior to restart following the first refueling outage by requiring, instead, resolution on a schedule which reflects the requirements of the recently published Final Hydrogen Control Rule. If, following completion of the MP&L research program on hydrogen control, it is determined that plant modifications are required to obtain final NRC approval that an adequate hydrogen control system for the plant is installed, the modifications will be completed on a schedule which is approved by the NRC.
As discussed during the July 29, 1985 meeting with the NRC staff on first refueling outage items, the attached amendment to License Condition 2.C.(33.d.2) is being requested to allow resolution of the hydrogen control issue generically. In a letter from L. F. Dale to H. R. Denton dated June 23, 1985, MP&L submitted a proposed schedule for meeting the Final Hydrogen Control Rule Requirements which were first published in the Federal Register on January 25, 1985. This proposed schedule was based on a detailed generic schedule of tasks identified in the Hydrogen Control Owners Group (HCOG) Program Plan and included completion of plant specific analyses. Because of the inherent uncertainties in this schedule, MF&L believes it is appropriate to modify the present License Condition which requires resolution of the hydrogen control issue prior to startup following the first refueling outage and require, instead, resolution in accordance with the Final Hydrogen Control Rule.
0601150137 851227 PDR P
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J16AECM85111301 - 1 Member Middle South Utilities System I I
3 AECM-85/0367 Page 2 MP&L is actively working to resolve both the plant specific and generic hydrogen control issues on the best schedule actually achievable and has been responsive to NRC concerns on this issue as discussed in the attachment to this letter.
MP&L has evaluated requesting the HCOG to complete Grand Gulf specific work on a schedule that will enable MP&L to meet its present license condition; however due to the e,omplexity of the task networks which are described in detail in the HCOG Program Plan, the completion of Grand Gulf specific work earlier in the program would not accelerate the overall MP&L schedule for resolving the hydrogen control issue. This is due to the integrated schedule developed by the HCOG which consists of both plant specific and generic work.
In many instances completion of generic work is a requirement for initiating plant specific work.
On October 22, 1985, in a letter from T. M. Novak to J. B. Richard, the staff stated that the MP&L proposed schedule for meeting the requirements of the Hydrogen Rule was unacceptable because it was not consistent with the existing license condition. MP&L hereby proposes an amendment to that license cordition and requests that the staff reconsider the proposed schedule submitted in accordance with the Rule on June 23, 1985. This amendment is consistent with the requirements of the Hydrogen Control Rule by allowing sufficient time for completion of the research program needed to resolve the hydrogen control issue.
A response to this letter is requested by February 28, 1986, to allow MP&L to properly schedule related work activities.
In accordance with the provisions of 10 CFR 50.30, three (3) signed originals and forty (40) copies of the requested amendment are enclosed. The attachment provides the complete technical justification and discussion to support the requested amendment. This amendment has been reviewed and accepted by the Plant Safety Review Committee (PSRC) and the Safety Review Committee (SRC).
Based on the guidelines presented in 10 CFR 50.92, it is the opinion of MP&L that this proposed amendment involves no significant hazards considerations.
In accordance with the requirements of 10 CFR 170.21, we have determined that the application fee is $150. A remittance of $150 is attached to this letter.
Yours ly,
- ! b e ODEsbos Attachments: GCNS PCOL-85/24 cc: (See Next Page)
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cc: Mr. T. H. Cloninger (w/a) .i '
Mr. R. B. McGehee (w/a)
Mr. N. S. Reynolds (w/a)
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, j Mr. H. L. Thomas (w/o) ['~
Mr. R. C. Butcher (w/a) (-
Mr. James M. Taylor, Director (w/a) ,
Office of Inspaction & Enforcement ,
U. S. Nuclear Regulatory Commission ,
Washington, D. C. 20555 (
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Dr. J. Nelson Grace, Regional Administrator (w/a) '
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U. S. Nuclear Regulatory Commission 4 Region II 101 Marietta St., N. W., Suite 2900 Atlanta, Georgia 30323 Dr. Alton B. Cobb (w/a) ,/
State Health Officer i State Board of Health Box 1700 Jackson, Mississippi 39205 i
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BEFORE THE UNITED STATES NUCLEAR REGULATORY COMMISSION ,
l LICENSE NO. NPF-29 DOCKET NO. 50-416 IN THE MATTER OF HISSISSIPPI POWER & LIGHT COMPANY and MIDDLE SOUTH ENERGY, INC.
and SOUTH MISSISSIPPI ELECTRIC POWER ASSOCIATION AFFIRMATION I, O. D. Kingsley, Jr., being duly sworn, stated that I am Vice President, Nuclear Operations of Mississippi Power & Light Company; that on behalf of Mississippi Power & Light Company, Middle South Energy, Inc., and South Mississippi Electric Power Association I am authorized by Mississippi Power & Light Company to sign and file with the Nuclear Regulatory Consnission, this application for amendment of the Operating License of the Grand Gulf Nuclear Station; that I signed this application as Vice President, Nuclear Operations of Mississippi Power & Light Company; and that the statements made and the matters set forth therein are true and correct to th est of my knowledge, information and belief.
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'O. D'. ding STATE OF MISSISSIPPI COUNTY OF HINDS SUBSCRIBED AND SWORN TO before me, a No ry PublJc, in and for the County and State above named, this g f. day of Ic/ dyw , 1985.
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My constission expires:
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SUBJECT:
Facility Operating License No. NPF-29, page 11, License Condition 2.C.(33.d.2)
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' DISCUSSION: It is proposed that the subject license condition be amended to saodify the requirement for resolution of the hydrogen control issue prior to restart following the first refueling outage by requiring, instead, resolution on a schedule which reflects the requirements of the recently published Final Hydrogen Control Rule. Should plant modifications be required to obtain NRC approval that an adequate hydrogen control system for the plant is installed, these modifications shall be completed on a schedule which is approved by the NRC. This proposed change to the operating license was discussed during the July 29, 1985 meeting, in which MP&L met with members of the NRC staff to review and discuss plans for the first refueling outage.
JUSTIFICATION: The subject license condition was incorporated into the Grand Gulf Operating License by the NRC during early efforts to better understand the hydrogen control issue for Mark III containments.
At the time this license condition was imposed it was believed to be adequate and appropriate based on existing programs and schedules in place to satisfy NRC requirements. Since the 1 license condition was proposed in 1983 and imposed in 1984, HP&L efforts in hydrogen control have expanded considerably and new insight into the hydrogen combustion phenomenon in a Mark III containment has led to an extensive test program designed to resolve the hydrogen control issue. The publication of the Final Hydrogen Control Rule early this year has for the first time permitted MP&L as part of the Hydrogen Control Owners Group to submit a schedule that was not only realistic but a schedule that was based on defined objectives intended to fulfill established requirements. MP&L believes that the schedule l submitted in accordance with the Final Hydrogen Control Rule should provide the basis for amendment of the existing License L Condition.
On October 2, 1980, the NRC published in The Federal Register the first of several proposed interim rules related to hydrogen control. Subsequent to that publication, in a letter dated l October 30, 1980, the NRC staff advised MP&L that the Conunission
( had decided that the matter of hydrogen control for degraded I core accidents in plants with Mark III containments should be resolved in the near term and not be deferred to rulemaking and l
requested that MP&L provide a description of its program to improve hydrogen control capability to cope with significant amounts of hydrogen. MP&L submitted a description of its l hydrogen control program on December 9, 1980 and proceeded with the evaluation and design of a hydrogen mitigation system.
! Because of the lack of a formal NRC rule or guidance, MP&L was a 1
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participant in the formation of the Hydrogen Control Owners Group (HCOG) in 1981. One of the purposes of this group was to develop a program plan that would provide guidance for resolving the issue. The first HCOG Program Plan was issued to the NRC on January 15, 1982. l l
In June of 1932 the NRC issued Supplement 2 to the GGNS Safety l Evaluation Report (SER) which concluded that GGNS Unit I could I operate safely at power levels not to exceed 5% of full power l without the proposed hydrogen control system. On June 16, 1982, l the Grand Gulf Operating License, NPF-13, was issued as a low power license and required satisfactory resolution of i outstanding concerns regarding hydrogen control in License Condition 2.C.(44)(d). This license condition required that MP&L provide the necessary technical submittals for justi-fication of interim operation with the hydrogen igniter system (HIS) prior to exceeding 5 percent power. Operation above 5 percent power was contingent upon approval of the HIS.
In SER Supplement 3, issued in July 1982, the staff presented its evaluation of the hydrogen control issue at Grand Gulf and concluded that full-power licensing on an interim basis was acceptable while the final evaluation of this issue was being completed. It was also indicated that the continuing research conducted by both the industry and the NRC into issues relevant to Mark III hydrogen control by deliberate ignition was expected to provide the basis for the final svaluation. .
In May 1983, the N2C issued Supplement 4 to the GGNS SER. This report provided an update on the continuing NRC review of the HIS as part of a final evaluation of deliberate ignition. In this report, the staff proposed that MP&L amend its research program on hydrogen control measures to include additional testing and analyses. Cn the basis of the continuing staff review in this area, it was suggested that License Condition 2.C.(44)(d) be revised to require NRC approval that an adequate hydrogen control system for the plant is installed and will perform its intended function in a manner that provides adequate safety margin prior to startup following the first refueling outage. License Condition 2.C.(44)(d) was subsequently revised and incorporated in the full power amendment (Amendment 13) to the GGNS Facility Operating License NPF-13, issued August 31, 1984. The current GCNS Facility Operating License, NPF-29, has an identical License Condition renumbered to 2.C.(33.d.2),
requiring resolution of the hydrogen control issue prior to startup following the first refueling outage.
It is and has been MP&L's intent to resolve the generic Mark III containment hydrogen concerns through HCOG activities to the maximum extent possible. This generic resolution will provide the basis for the final evaluation of the GGNS HIS except vihere additional GGNS specific evaluation is needed. MP&L through its
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endorsement of the HCOG research program has committed to continue the analysis and testing required to resolve NRC concerns on the HIS. Significant efforts in the past by MP&L have led to the development of a computer code for analyses of the Mark III containment response during hydrogen burns, the submittal of substantial analyses specific to Mark III containments and substantial resources provided for generic issue resolution through HCOG. As chairman of the HCOG since the group's inception in 1981, M?&L commits to continue their active role in the ongoing effort to resolve the hydrogen control issue.
The first major testing program initiated on the part of HCOG was the 1/20th scale test program. The objective of this testing program was to qualitatively assess the effects of variations in key parameters that were thought to influence the hydrogen combustion phenomena in preparation for proposed larger scale testing. Based on preliminary results and analysis, HCOG believed that the 1/20th scale test program would ultimately lead to resolution of the hydrogen control issue.
Following analysis of final results and discussion with the NRC, HCOG concluded that results of the 1/20th scale test program were not sufficient to resolve the hydrogen control issue. New concerns required MP&L to take part in an extensive effort to better define the conditions that may prevail during a degraded core accident. The staff concurred that final resolution could not be achieved based on data taken from small scale testing (i.e. 1/20th scale tests) and that MP&L should continue the investigation of hydrogen combustion through testing in a larger facility, such as the proposed quarter scale test facility.
On July 28, 1983 in a meeting between the NRC and HCOG, the NRC staff was notified that HCOG had authorized initiation of the construction phase and completion of the quarter scale Mark III Hydrogen Combustion Test Program. At this time, it was estimated, based on the quarter scale test program scope, that testing would be performed between May and September 1984 and lead to issuance of a final test report by the year's end. As the staff is aware, the program has expanded and unavoidable delays in test facility construction have occurred. The NRC staff has been informed of these increases in scope and schedule delays through HCOG-NRC meetings. Many of the situations in which the scope was expanded resulted from responding to NRC concerns on the quarter scale test program. Significant progress has been made towards resolution of the hydrogen control issue, and the quarter scale test program, though not yet complete, has already enabled the Mark III owners and the NRC to better understand the hydrogen combustion phenomena for postulated degraded core accidents.
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MP&L believed that the requirement for resolution of the hydrogen control issue prior to startup following the first refueling outage was appropriate and achievable based on information available at the time the License Gondition was t imposed. Now, with new information available and realistic schedules in place for completion of the quarter scale test program, MP&L believes this requirement is no longer appropriate.
1 On January 25, 1985, in The Federal Register, the NRC published
! ~the Final Hydrogen Control Rule, the first formal regulatory guidance for resolving the hydrogen control issue. This rule requires MP&L to justify the hydrogen control system for Grand Gulf by completing a suitable program of experiment and analysis on a schedule approved by the NRC. The Final Hydrogen Control Rule required MP&L to submit a proposed schedule for meeting the requirements of the Rule. In a letter from L. F. Dale to H. R.
- Denton, dated June 23, 1985, MP&L submitted a proposed schedule for meeting these requirements. This proposed schedule is based l
on a detailed generic schedule of tasks identified in the HCOG Program Plan and includes completion of plant specific analyses.
This schedule projects a program completion date in early 1987.
MP&L believes that this proposed schedule is sufficient to ensure that a hydrogen control system providing adequate safety margins exists for Grand Gulf. MP&L also believes that it is appropriate to modify the present License Condition requiring resolution of the hydregen control issue prior to startup following the first refueling outage (scheduled to be a 13 week outage starting on June 1, 1986) and instead require resolution in accordance with the Final Hydrogen Control Rule. The formal regulatory guidance for resolving the hydrogen control issue should be used to establish the basis for the proposed amendment to the existing license requirement. Hence, MP&L proposes that the hydrogen research program be completed on a schedule which reflects the requirements of the recently published Final Hydrogen Control Rule and that any required plant modifications be completed on a schedule approved by the NRC.
By letter dated October 22, 1985 from T. M. Novak to J. B.
< Richard, the staff stated that the MP&L proposed schedule for meeting the Commission's rule on hydrogen control systems was unacceptable because it was not consistent with existing license condition 2.C.(33.d.2) of the Facility Operating License. MP&L has given consideration to having work relevant to Grand Gulf completed by BCOG on a schedule that will enable.Mr&L to meet
- its license condition, but because of the nature of the generic effort, completing Grand Gulf specific work l earlier in the program will not accelerate the overall schedule. NP&L i requests that the staff approve the proposed ansaament to this license condition and reconsider the proposed schedule submitted on June 23, 1985 for meeting the final Hydrogen Control Rule requirements.
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SIGNIFICANT HAZARDS CONSIDERATION:
The staff's evaluation as referenced in the May 1983 Grand Gulf Safety Evaluation Report, Supplement No. 4, provided the basis for concluding that the hydrogen ignition system for Grand Gulf was acceptable for an interim period. Although test results and analyses in Supplement 5 to the GGNS SER suggested that more severe thermal conditions may exist in the containment than previously considered, preliminary results from the quarter scale test program indicate that those test results and analyses were overly conservative due to the lack of applicability to the Mark III containment.
I The technical evaluation of whether or not the proposed amendment involves significant hazards consideration is centered on the three standards of 10CFR 50.92(c). These are whether the amendment will:
- 1) involve a significant increase in probability or consequences of an accident previously evaluated;
- 2) create the possibility of a new or different kind of accident from any accident previously evaluated; or
[ 3) involve a significant reduction in margin of safety.
1 The hydrogen ignition system (HIS) is designed to mitigate the consequences of a severely degraded core and its use or design is not related to those design basis accidents as discussed in the FSAR.
4 This proposed change to the operating license does not involve a significant increase in the probability or consequences of an accident previously evaluated. The amendment does not involve a change to either the hardware, logic or procedures that would result in an effect on the probabilities or consequences of
' accidents as previously analyzed in the FSAR. MP&L has pre-viously demonstrated that the essential equipment is likely to survive the high temperature associated with hydrogen l combustion to assure that a safe shutdown condition may be j reached and maintained. The results of the quarter scale test program are, at worst, expected to lead to very few minor modifications to further assure equipment survivability. The quarter scale test program and other analyses being completed as part of the HCOG program are therefore expected to be a con-firmation of existing analyses and conclusions on the adequacy of the installed hydrogen ignition system. Since socidents leading to severely degraded core that would require the use of
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the hydrogen ignition system are of such low probability.
delaying such confirmation of the adequacy of the installed system until after the HCOG program is complete will not j significantly alter the probability of an accident nor would it
- increase the consequences of previously evaluated accidents.
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The proposed change to the operating license does not create the possibility of a new or different kind of accident from any accident previously evaluated. The amendment does act involve a change to either the hardware, logic or procedures that would 2 create the possibility of a new or different kind of accident
. from any accident previously evaluated. By delaying the final 3 resolution of the hydrogen control issue, the proposed amendment cannot create the possibility of a new or different kind of accident from any accident previously evaluated. Also, the results of the quarter scale test program and other analyses being completed as part of the HCOG program are' expected to be confirmatory in nature.
The proposed change will not involve a significant reduction in the margin of safety. The proposed change merely continues operation with the present hydrogen ignition system pending confirmation of adequacy for certain severe thermal conditions.
No margin of safety is affected and the proposed change does not involve a relaxation of the criteria used to establish the safety limits, the bases for limiting safety system settings, the bases for limiting conditions of operation, a change to technical specifications or a change in plant operation.
Therefore, extending this interim period from the end of the first refueling outage to a schedule established for meeting the Hydrogen Rule Requirements which is acceptable to the NRC does not involve a significant hazards consideration.
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. I 2) Research to investigate the conditions leading to and consequences resulting from hydrogen combustion in the wetwell and con-
. tainment. Testing shall be perfomed in a larger scale facility such as the
' one-quarter scale test facility proposed by MP&L;
- 3) Research to investigate the conditions leading to and consequences resulting from hydrogen combustion in the drywell;
- 4) Confimatory tests on themal response of selected equipment exposed to hydrogen burns.
(b) MP&L shall perfom feasibility studies to examine the options for enhancing equipment survivability for essential equipment located in the vicinity of the suppression pool or other regions subjected to severe environments.
The options to be studied in such feasibility studies shall include themal shielding, addi-ggg m usp tional cooling, and relocation of essential equipment.
pcOL 2.7/M MP&L sus C ry t hydrogencontrolsy p ant is installed and w 11j ntende in a manner :
des adequate safety margins.
(e) Instrumentation for Detection of inadequate Core Cooling (II.F.2, 5ER, 55ER #2)
MP8L shall submit a report addressing the analysis performed by the BWR Owners' Group regarding additional instrumentation relative to inadequate core cooling and shall implement the staff's requirements after the completion of the staff's review of this report. These modifications shall be completed on a schedule acceptable to the staff.
(f) Modification of Automatic Depressurization_ System logic _ _
l Teasibility for Increased Diversity for 5eme Event sequences (II.K.3.18, 5ER D 5ER #2, 55ER #4)
Prior to startup following the first refueling outage, MP&L shall provide, for NRC review justification Tor the timer delay settings, revisions to the emergency procedures
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Amended License Condition 2.C. (33.d.2) PCOL-85/24 2a. MP&L shall complete its research program on hydrogen control to show that the ' hydrogen control system will perform its intended function in a manner that provides adequate safety margins. This research program shall be completed on a echadule which reflects the requirements of the recently published Final Rydrogen Control Rule,
- b. If it is determined that plant modifications are required to obtain NRC approval that an adequate hydrogen control system for Grand Gulf is installed, then these modifications shall be completed on a schedule which is approved by the NRC.
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