ML20211H223
| ML20211H223 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 08/26/1999 |
| From: | NIAGARA MOHAWK POWER CORP. |
| To: | |
| Shared Package | |
| ML20211H196 | List: |
| References | |
| NUDOCS 9909020044 | |
| Download: ML20211H223 (15) | |
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i ATTACHMENT B l NIAGARA MOHAWK POWER CORPORATION l l LICENSE NO. DPR 63
- DOCKET NO. 50 220 l Suonortina Information and No Sionificant Hazards Consideration Analvsis l
INTRODUCTION I
l Noble Metal Chemical Addition (NMCA) has been developed as a method to enhance the effectiveness of Hydrogen Water Chemistry (HWC)in mitigating Intergranular Stress Corrosion Cracking (IGSCC) in Boiling Water Reactor (BWR) vessel internal components. The use of
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i NMCA allows lower injection rates of hydrogen, which in turn reduces plant radiation exposure.
IGSCC is caused by the simultaneous presence of three conditions: stress, environment and I l susceptible materials. Removing any one of these items causeb IGSCC growth to be I significantly reduced or stopped. Mitigation of IGSCC in operating BWRs can be effectively accomplished by reducing the bulk liquid oxidant (oxygen and hydrogen peroxide). Hydrogen added to the feedwater suppresses the radiolytic generated oxidant concentration in the core regions, and enhances the recombination reactions in the downcomer. The reduction in oxidant level can reduce the electrochemical corrosion potential (ECP). Reducing the ECP requires hydrogen addition rates which result in increased main steam line radiation levels from volatile "N compounds. Through NMCA, the catalytic behavior of noble metals provides an opportunity to efficiently achieve a dramatic reduction in ECP and stress corrosion cracking at lower hydrogen injection rates by catalytically reacting hydrogen with all oxidants at the catalytic surface. NMCA utilizes the reactor coolant as the transport medium to deposit minute amounts of noble metal (platinum and rhodium) on all wetted reactor component surfaces. Even at high bulk liquid oxidant levels, with the ratio of hydrogen to oxygen in excess of stoichiometric, the corrosion potential of the reactor vessel and internal components decreases significantly and crack initiation and growth are greatly reduced. Low hydrogen addition rates are still necessary to provide sufficient excess hydrogen at the surface of components treated with noble metals. Oxidants that diffuse to the component surface will immediately react with the excess hydrogen to form water. In this way the boundary layer of all treated, wetted components is depleted of oxidants and a very low corrosion potential is maintained.
in summary, NMCA utilizes very reactive surfaces to maintain oxidant deficient water in contact with reactor components. In contrast, moderate to high hydrogen addition rates are aggressive methods that must reduce the oxidant content of the entire bulk coolant to be effective. Therefore, because of the lower operational dose rates, NMCA in conjunction with low hydrogen addition rates is a better approach to mitigate and prevent IGSCC than moderate to high hydrogen addition rates alone.
NMCA will result in reactor coolant conductivity limits exceeding limits contained in TS 3.2.3 and guidelines delineated in the associated Bases. The proposed TS amendment will support 1 of 5
the implementation of NMCA at NMP1 by revising the subject TS and Bases. Specifically, the proposed amendment will permit a higher TS reactor water conductivity limit (20.Opmho/cm) during the application period of NMCA. The application period includes post-NMCA injection cleanup activities conducted prior to returning the plant to power operation. The TS limit is also increased from 1 pmho/cm to 2 pmho/cm for a 5 month period of power operation I following NMCA. Changes to the Bases are proposed consistent with the TS changes.
EVALUATION The current reactor water chemistry limits in TS 3.2.3 and the guidelines in the associated Bases were established to prevent damage to materials in the reactor vessel, primarily stainless steel and the zirc alloy cladding. Limits are placed on reactor water conductivity, sulfate, and chloride concentrations. Conductivity is limited because it provides an indication of abnormal conditions and the presence of impurities in the reactor water. Chloride and sulfate limits are specified to reduce stress corrosion cracking of stainless steel. When the ;
continuously indicated conductivity is in its proper, normal range, acidity (pH), chloride, sulfate, and other impurities which are not continuously monitored are also expected to be within their normal ranges. When conductivity becomes abnormal, chloride and sulfate measurements are needed to determine whether or not concentrations are also out of normal ranges.
The NMCA application involves injection of a platinum-rhodium solution into the reactor water at a very dilute concentration at a reactor water temperature between approximately 250 to 350 degrees F. Available data indicates that there is no basis for concern for elevated crack initiation or propagation during the NMCA application due to increased conductivity in this temperature range. Based on industry experience, the process may cause an elevation in conductivity to 20 pmho/cm, with the majority of the conductivity primarily due to the
. presence of (in descending order of contribution) nitrite, sodium, nitrate, zinc, hexahydroxyplatinate, hexanitrorhodium and hydroxyl ions. Most of these are the ionization and reaction products of the process chemistry. However, unlike the effects of chloride and sulfate, these residual ions have minor offects on IGSCC in reactor vesselinternal components or reactor fuel.
Sulfate and chlorides exist as trace impurities in the noble metal concentrated solutions.
However, the impact from NMCA on sulfate and chloride concentrations is negligible because the trace quantities are very low. Specifically, the chloride and sulfate concentration in the primary coolant is expected to increase less than 5 ppb during the NMCA application.
Consequently, under the NMCA application conditions, negligible crack initiation or propagation (less than two (2) mils) is expected to occur. Any potential risk of increased crack growth rate (CGR) due to the residual ions during the application period will be outweighed by the reduction of CGR during subsequent operation with the noble metals in place.
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As noted above, the addition of these ionic species during the NMCA may cause the reactor water conductivity to reach 20.0 (pmho/cm). Existing TS 3.2.3a and 3.2.3c.1 limit conductivity to 1 mho/cm and 5 pmho/cm, respectively. Accordingly, NMPC requests that TS 3.2.3a and 3.2.3c.1 conductivity limits be raised to 20 umho/cm during the NMCA application.
During NMCA injection, conductivity samples will be taken using a temporary sample skid.
This is necessary to prevent contaminating the normal sample lines with NMCA which could affect the sample results.
Following NMCA application, industry experience indicates that there may be an elevated conductivity approaching the 1 mho/cm (i.e., up to approximately .7 umho/cm) limit delineated in TS 3.2.3a and 3.2.3b for up to 5 months of power operation. To provide operating margin, NMPC proposes to raise this limit to 2 pmho/cm for up to 5 months of power operation following application. The increase in the conductivity has been attributed to an increase in soluble iron and pH in the reactor water, which results from the application of the noble metals and its affect on the deposits on the fuel. Soluble iron nor increased pH contribute to IGSCC crack growth. The existing 1 mho/cm limit is based on EPRI guidelines action Level 2 for power operation, which assumes normal conductivity below .3 pmho/cm.
Increasing the limit to 2pmho/cm during the period when soluble iron levels are high provides an equivalent operating margin consistent with the chloride and sulfate limits. Accordingly, this temporary elevated conductivity is expected, acceptable and not considered " abnormal" as discussed in TS 4.2.3 and associated Bases (i.e., >.19 pmho/cm). Therefore, following NMCA, the increased sampling (8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> versus 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />) required during " abnormal" conditions is not required. Daily sampling of coolant for conductivity, chlorides, and sulfates will continue to be performed to assure water quality.
CONCLUSIONS The proposed TS amendment will permit temporary increases in the allowed conductivity limits to support the implementation of NMCA at NMP1. NMCA will enhance the effectiveness of HWC in mitigating IGSCC in vessel internal components.
Studies and observations conducted to date have indicated that the relatively low temperature, the limited time frame of application and the non-aggressive ionic species resulting from noble metalinjection will not adversely affect crack initiation or propagation in the resulting high conductivity environment. Based on crack growth measurements under similar conditions, the maximum predicted crack growth increment under NMCA within the limits stated above will be negligible (less than two (2) mils) for the entire process period. The elevated conductivity levels following NMCA are attributed to an increase in soluble iron and pH in the reactor water which will not adversely affect crack growth. Therefore, the proposed TS amendment will not adversely affect the health and safety of the public and will not be inimical to the common defense and security.
NO SIGNIFICANT HAZARDS CONSIDERATION ANALYSIS According to 10 CFR 50.91, at the time a licensee requests an amendment to its operating license, the licensee must provide to the NRC its analysis using the standards in 10 CFR 50.92 concerning the issue of no significant hazards consideration. According to 10 CFR 50.92(c),
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i a proposed amendment to an operating license involves no significant hazards considerations if operation of the facility in accordance with the proposed amendment would not:
- 1. Involve a significant increase in the probability or consequences of an accident previously evaluated; or
- 2. Create the possibility of a new or different kind of accident from any accident previously evaluateri; or I
- 3. Involve a significant reduction in a margin of safety. I NMPC has evaluated this proposed amendment pursuant to 10 CFR 50.91 and has determined that it involves no significant hazards considerations.
1 The following analyses have been performed: l The operation of Nine Mile Point Unit 1. in accordance with the cronosed amendment, wili not involve a sianificant increase in the orobability or consecuences of an accident oreviousiv f evaluated.
The proposed amendment to TS 3.2.3 willraise the reactor water conductivity limit during and following NMCA application. This changs will allow the application of a layer of noble metals to the reactor vesselinternals to enhance the effectiveness of HWC in mitigating IGSCC. An increased cunductivity is expected both during and following NMCA. However, during NMCA, this_ increase is caused principally by residual ionic species which do not contribute to IGSCC. ]
Following NMCA application, the increased conductivity is expected to be due to soluble iron J and increased pH which has no adverse affect on crack growth. Accordingly, the proposed change will not adversely affect reactor vessel internals or reactor fuel such that the probability of an accident is increased. The proposed change will not alter the current TS requirements concerning equipment needed to mitigate the consequences of an accident nor affect the performance of this equipment. Therefore, operation in accordance with the proposed amendment will not create an increase in the probability or consequences of an accident previously evaluated.
The coeration of Nine Mile Point Unit 1. in accordance with the orooosed amendment. will not create the nossibility of a new or different kind of accident from any accident oreviousiv evaluated.
The proposed amendment to TS 3.2.3 will raise the reactor water conductivity limit during and following NMCA application. This change will allow the application of a layer of noble metals to the reactor vessel intemals to enhance the effectiveness of HWC in mitigating IGSCC.
Except for these temporary exceptiens to the existing reactor coolant chemistry specification, l no new plant or system operating modes are being introduced and plant equipment will continue to perform their intended function. An increased conductivity is expected both during and following NMCA. However, during NMCA, this increase is caused by ionic species which do not contribute to IGSCC. Following NMCA application, the increased conductivity is due to soluble iron and increased pH which has no adverse affect on crack growth.
Accordingly, the p.oposed changes will not affect plant equipment in a way to create a new )
or different kind of accident. Therefore, operation in accordance with the proposed i 4 of 5
amendment will not create the possibility of a new or different kind of accident from any accident previously evaluated.
The coeration of Nine Mile Point Unit 1. in accordance with the orocosed amendment. wilinot involve a sianificant reduction in a maroin of safety.
The proposed amendment to TS 3.2.3 will raise the reactor water conductivity limit during and following the application of NMCA. During NMCA, the proposed change willraise the reactor water conductivity limit in TS 3.2.3a and 3.2.3c.1 to 20 umho/cm. However, the expected increase in coolant conductivity is caused principally by ionic species which do not contribute to IGSCC and, therefore, will not adversely affect reactor vessel intemals or reactor fuel. '
Following NMCA application, industry experience indicates that there may be an elevated conductivity approaching the 1 mho/cm conductivity limit delineated in TS 3.2.3a and 3.2.3b. To orovide operating margin, NMPC proposes to raise this limit to 2 pmho/cm for up to 5 months of power operation following application. The expected increase in the conductivity is attributed to an increase in soluble iron and pH in the reactor coolant which results from the application of the noble metals and its affect on the deposits on the fuel.
Soluble iron nor increased pH contribute to IGSCC crack growth. The existing 1 mho/cm limit is based on EPRI guidelines action Level 2 for power operation, which assumes normal conductivity below .3 pmho/cm. Increasing the limit to 2pmho/cm during the period when soluble iron levels are high provides an equivalent operating margin consistent with the chloride and sulfate limits. Accordingly, this temporary (< 5 months) elevated conductivity is expected, acceptable, and not considered " abnormal" as discussed in TS 4.2.3 and associated Bases. Daily samples of coolant for conductivity, chlorides and sulfates will continue to be performed to assure water quality.
Therefore, operation in accordance with the proposed amendment willnot involve a significant reduction in a margin of safety.
5 of 5
ATTACHMENT C NIAGARA MOHAWK POWER CORPORATION l LICENSE NO. DPR-63 DOCKET NO. 50 220 Ellaibility for Cateaorical Exclusion from Performina an Environmental Assessment 10 CFR 51.22 provides criteria for, and identification of, licensing and regulatory actions eligible for exclusion from performing an environmental assessment. Niagara Mohawk Pov '-
Corporation (NMPC) has reviewed the proposed amendment and determined that it does riot involve a significant hazards consideration, and there will be no significant change in the types or a significant increase in the amounts of any effluents that may be released offsite; nor will there be any significant increase in individual or cumulative occupational radiation exposure.
Therefore, the proposed amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9) and, pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assessment is required to be prepared in connection with this license amendment application.
i l
l
)
. t ATTACHMENT D NIAGARA MOHAWK POWER CORPORATION l LICENSE NO. DPR-63 '
DOCKET NO. 50-220 4 Marked Un Cooy of the Proposed Chanaes to the Current Technical Soecifications (TS)
The current version of pages 96,97 and 98 have been marked-up by hand to reflect the proposed changes. The hand marked-up pages include the proposed changes to the TS, as well as the associated changes to the Bases.
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