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{{#Wiki_filter:2/19/2021                                          blob:https://www.fdms.gov/fb1f6fd9-41dd-4a25-be0f-86623a52ba77 SUNI Review Complete Template=ADM-013 As of: 2/19/21 4:22 PM E-RIDS=ADM-03        Received: February 18, 2021 PUBLIC SUBMISSION                                                  ADD: Stanley Gardocki, Liliana Status: Pending_Post Tracking No. 1k5-9lv6-teyn Ramadan, Mary Neely                Comments Due: February 18, 2021 Comment (2)          Submission Type: Web Publication Date:
{{#Wiki_filter:}}
1/19/2021 Docket: NRC-2020-0279                                              Citation 86 FR 5267 DG-1303 Application and Testing of Safety-Related Diesel Generators in Nuclear Power Plants Comment On: NRC-2020-0279-0001 Application and Testing of Safety-Related Diesel Generators in Nuclear Power Plants Document: NRC-2020-0279-DRAFT-0004 Comment on FR Doc # 2021-00940 Submitter Information Name: Frances Pimentel General Comment See attached file(s)
Attachments 02-18-2021_NRC_Industry Comments DG-1303 blob:https://www.fdms.gov/fb1f6fd9-41dd-4a25-be0f-86623a52ba77                                                                  1/1
 
FRANCES PIMENTEL Senior Project Manager, Risk and Technical Support 1201 F Street, NW, Suite 1100 Washington, DC 20004 P: 202.739.8132 fap@nei.org nei.org February 18, 2021 Office of Administration Mail Stop: TWFN-7-A60M U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 ATTN: Program Management, Announcements and Editing Staff Project Number: 689
 
==Subject:==
NEI Comments on Draft Regulatory Guide DG-1303, Application and Testing of Onsite Emergency Alternating Current Power Sources in Nuclear Power Plants, Docket ID NRC-2020-0279.
Subm itted via regulations.gov
 
==Dear Program Management,==
Announcements and Editing Staff:
The Nuclear Energy Institute (NEI) 1, on behalf of our members, appreciates the opportunity to provide comments on Draft Regulatory Guide DG-1303, Application and Testing of Onsite Emergency Alternating Current Power Sources in Nuclear Power Plants. The purpose of this letter is to provide the attached comments which recommend several changes to improve clarity and consistency on the recommended practices, testing, and maintenance guidance provided and to raise backfitting and forward fitting concerns to your attention, as further described below. Please note that the comments in the attachment are prioritized by importance with 1- (high), 2- (medium), and 3- (low), followed by editorial.
While the industry agrees with many of the proposed changes in this revision, several other changes raise concerns with how the associated industry guidance documents (IEEE 387-2017 and IEEE 2420-2019) are approved and supplemented. Of greatest concern is a statement in the discussion section that [t]he onsite emergency AC power source should be capable of operating for a minimum of 30 days The industry does not agree that there is a generic minimum requirement regarding mission time for emergency AC power sources. The industry's position is best articulated in the PWROG PA-LSC-1707, Industry position paper -
Emergency Diesel Generator Mission Time, which states: [u]nless a plant was licensed with a specific
'mission time' for the EDGs, there is none. The term 'mission time' applied to the EDGs is not a part of any 1
The Nuclear Energy Institute (NEI) is responsible for establishing unified policy on behalf of its members relating to matters affecting the nuclear energy industry, including the regulatory aspects of generic operational and technical issues. NEIs members include entities licensed to operate commercial nuclear power plants in the United States, nuclear plant designers, major architect and engineering firms, fuel cycle facilities, nuclear materials licensees, and other organizations involved in the nuclear energy industry.
 
February 18, 2021 Page 2 standard plant licensing basis. Rather, the establishment of EDG mission time is highly unit-specific based on primary system design, vital bus scheme and environmental risk factors as determined by each stations IPEEE and approved by the NRC in NUREG 1742. Given the plant-specific nature of this issue, the statement indicating that there is a generic requirement for, or expectation of, a 30-day mission time raises both backfitting and forward fitting concerns, which have not been evaluated in the associated regulatory analysis. Thus, we request that this statement be removed from the regulatory guide. This issue is discussed in Attachment 1 to this letter (see comments 1 and 2).
The current version of DG-1303 also includes a number of supplements to the approved IEEE standards that appear to have been misapplied. This includes supplements for provisions already included in the IEEE standards (but the wrong section was referenced), duplicate supplements with the same requirements, supplements for accelerated maintenance schedules that do not apply to all EDG makes and models, requirements for simulated environmental conditions during testing and supplements for off-site power supplies beyond the scope of this Regulatory Guide and the associated IEEE standards. Finally, the inclusion of Combustion Turbine Generators (CTGs) in this revision of the Regulatory Guide is considered appropriate and welcome. However, several sections discussing and providing the regulatory position for CTGs used EDGs as a starting point and did not appropriately modify the requirements based on the unique design of CTGs. These discrepancies are considered to hinder the intent and effectiveness of the Regulatory Guide as a useful tool to both end users and the NRC.
We appreciate the NRCs effort in developing this draft guidance and encourage your consideration of all stakeholder comments prior to finalizing this draft Regulatory Guide. Given the long-lasting impact of the final document, we recommend a public meeting be scheduled to discuss in more detail the priority 1 and 2 comments included in the attachment and how the staff plans to address them. We trust that you will find these comments useful and informative as you finalize the draft and we look forward to future engagement on this important matter. Please contact me at fap@nei.org or (202) 739-8132 with any questions or comments about the content of this letter or the attached comments.
Sincerely, Frances A. Pimentel Attachment c:      Liliana Ramadan, RES/DE/ICEEB/EET, NRC Stanley Gardocki, RES/DE/RGGIB, NRC
 
Attachment 1 Consolidated Comments on Draft Regulatory Guide DG-1303 Application and Testing of Onsite Emergency Alternating Current Power Sources in Nuclear Power Plants No. Section                                      Comment/Basis                                                Recommendation                Priority Background, Onsite Emergency AC Power Sources: Paragraph 8, Last Sentence              This should be removed since, per          1 (Page 7), The onsite emergency AC power source should be capable of operating for      PWROG PA-LSC-1707, Unless a plant a minimum of 30 days with replenishment of fuel oil and other fluids/materials, as      was licensed with a specific Mission required.                                                                              Time for the EDGs, there is none. The inference of a 30-day capability The IEEE/PES/NPEC/SC-4 WG 4.2 infers this statement refers to an EDG mission time      requirement of the EDGs is not a part capability of 30 days; however, it is not in Section C, Staff Regulatory Guidance, of of any standard plant licensing basis.
: 1. B. the Draft Guide. This was not part of any qualification type-testing and also was not part of any original design specifications used by the OEM when furnishing EDGs to      If the item regarding 30-day capability the nuclear industry.                                                                  for EDGs is to remain in the Reg.
Guide, further clarification needs to be provided for mechanism of verification (test). This is not part of any NUREG 1431, 1432, or 1433 Tech Specs.
Background, Onsite Emergency AC Power Sources: Paragraph 8, Last Sentence              Delete this sentence. The issue is well    1 (Page 7), The onsite emergency AC power source should be capable of operating for      described in the first paragraph of the a minimum of 30 days with replenishment of fuel oil and other fluids/materials, as      background section and is consistent required.                                                                              with other versions of RG 1.9:
The minimum time of operation of the emergency AC power source should not be            An onsite emergency AC power included in this RG due to the following reasons: 1) minimum EDG time of operation      source selected for use in an electric for some plants is established by accident analysis in their licensing basis, and      power system should be able to (1)
: 2) minimum EDG time of operation should be based on plant design and established        start and accelerate a number of large
: 2. B. by the nuclear vendors analysis vs. a common time for all.                            motor loads in rapid succession, while maintaining voltage and frequency Some plants have performed site-specific plant accident analysis to determine the      within acceptable limits, (2) provide minimum operating time for an emergency AC power source, with results less than 30      power promptly to engineered safety days. One example is the Callaway analysis that was approved by the NRC.                features if a loss of offsite power (LOOP) and an accident occur at the In addition, the PWROG has developed a document PWROG-20014-NP, that                    same time, and (3) supply power addresses this concept. Perhaps this document would be the place to address any        continuously to the equipment concerns with the industry, vs. in the background discussion for this Regulatory        needed to maintain the plant in a safe Guide.
 
No. Section                                          Comment/Basis                                                Recommendation                Priority condition if an extended LOOP In the many revisions of RG 1.9 and associated NRC documents on EDGs, the first              occurs.
mention of a 30 requirement was in parentheses in Revision 4 which was added following the industry review, without a chance for industry comment. The text in Section B states: supply power continuously to the equipment needed to maintain the plant in a safe condition if an extended (e.g., 30-day period should be considered with refueling every 7 days) LOOP occurs. The NRC was questioned in a public meeting (by NEI) on why this was added in the final version without industry review, and requested it be deleted. The NRCs written response was that The staff intended that the 30-day mission time for EDG should be considered if an extended LOOP occurs. Though in Section B, with the use of the word should the statement now can be read like a requirement that will be used to challenge operating plants Section 2.2 should be deleted because 1) Provisions are already provided in IEEE 387-        Section 2.2 should be deleted              1 2017, and 2) it is not practical to simulate environments during testing. Additional        because 1) Provisions are already information is provided as follows:                                                          provided in IEEE 387-2017, and 2) it is
: 1) Provisions are already provided in IEEE Std 387-2017:                                    not practical to simulate
: a. 7.5 Test description (pre-lubrication and manufacturers recommendations for          environments during testing.
reducing wear)
: b. 7.5.1 Slow-start test (manual start, standby conditions)
: c. 7.5.3 Fast-start test (manual start; standby conditions)
: d. 7.5.4 Loss of offsite power test (load shedding, automatic start, load sequencing)
: e. 7.5.5 Safety injection auction signal (SIAS) test (automatic start)
: f. 7.5.6 Combined SIAS and LOOP test - (load shedding automatic start, load sequencing)
: g. 7.5.9 Endurance and load test (operating time)
: 3. C.2.2  2) It is not practical to simulate environments during testing.
: a. NEIs comment on the 4th revision of RG 1.9 was regarding environments (e.g.
temperature, humidity): Sites currently have no capability to control the environment - outside temperature and/or humidity - for current testing. For future plants controlling these parameters would be very cost prohibitive to test at these extremes. Testing from normal standby conditions is appropriate.
: b. The NRC Response to RG 1.9, R4 comments ({{letter dated|date=August 22, 2007|text=August 22, 2007 letter}} to NEIs Mr. Adrian P. Heymer, from NRCs William Reckley): The staff agrees that the use of the words simulate...environments in Regulatory Position 1.5 is subject to different interpretations. The staff intended that the effects of environments (temperature and humidity) should be considered in establishing the rating of the diesel generator.
: i. It is our position that these items are covered in IEEE Section 4, Principal design criteria, subsection 4.1.2.a Design conditions, items 3) Temperatures
 
No. Section                                        Comment/Basis                                                  Recommendation              Priority at equipment locations (minimum and maximum with durations and average annual ambient) and 6) Humidity (minimum and maximum with durations)
: c. Continued response from the NRC was The tests should confirm that the capacity margin provided in the design of the EDG is continued to be adequate for design basis event mitigation during worst case expected temperature and humidity condition for a given plant.
: i. It is our position that the existing diesel rooms do not have the capability to simulate temperature and humidity during testing, and that for future plants controlling these parameters would be very cost prohibitive to test at these extremes. Testing from normal standby conditions is appropriate. This proposed C.2.2 position should be eliminated.
: d. The NRC stated in the letter that, The staff agrees to include this clarification in the next revision of RG 1.9 regarding this issue. It does not appear that this was addressed in this revision.
Most but not all manufacturers do not require accelerated maintenance                      This requirement should be removed        1 requirements for operating time above the nominal rating. In addition, this time          as IEEE Std 387-2017, Section 6.5.1 should be limited to the 2 hours of the endurance run at 105-110% load. The Reg.          covers establishing a maintenance Guide should clarify this is planned loading. Additionally, the Reg. Guide needs to        program (with sufficient technical acknowledge the variety of rating schemes currently in place in the industry. Each of      basis) that factors in operating hours, these rating levels represents the manufacturers estimated liability for warranty        testing, condition, operating claim at a given load level. Accordingly, the resulting ratings lack consistent basis and  experience, or a combination of these their application toward maintenance interval adjustments is of questionable validity. for emergency diesel generator units.
The application of the proposed guidance should be reviewed by the EDG manufacturer against their rating basis with appropriate clarification/changes            Also consider adding language that
: 4. C.2.3 documented for the licensee. There are, however, some EDG manufacturers that no            acknowledges and accepts longer exist, meaning that a valid review of rating basis is not possible. In these cases, momentary episodes where the load the Reg. Guide needs to include allowance for EDG owner group recommendations              is above the EDG rating.
for accelerated maintenance as appropriate.
Current STS recognizes that grid instability and cycling plant loads can perturbate EDG load while paralleled with offsite power. Accordingly, allowance is specifically provided for short-term momentary episodes where load is above the specified level. Likewise, if kept, NRC should allow momentary excursions without penalty or superfluous accounting burden.
IEEE Std 387, Clause 4.4, Table 1 scope is for design considerations for the EDG. It is    This should be removed because this        1
: 5. C.2.4  not intended to address considerations for off-normal preferred power supply. If          is out of scope of RG 1.9.
protection design criteria, the EDG system boundary should be respected. Any Class
 
No. Section                                    Comment/Basis                                                Recommendation            Priority 1E bus protection (IEEE Std 308) or Preferred Power Supply (IEEE Std 765) is out of scope of IEEE Std 387.
Section 2.8 is redundant to Section 2.2.                                            Delete Section C.2.8                      1
: 6. C.2.8 In IEEE 387, "Continuous rating" with 8760 hours operation is defined along with    Remove requirement 3.1. See                1 "short time rating" which requires 2-hour operation in any 24-hour period. However, Comment/Basis.
IEEE Std 2420 does not have "short time rating," and therefore uses only term of
: 7. C.3.1 rating instead of continuous rating. Because the rating of combustion turbine-generator unit is already defined in IEEE Std 2420, Section 3.1, this requirement should be removed from RG 1.9.
In case of emergency (accident or LOOP) startup, purge process affects startup time Recommend the follow change to            1 of emergency power system. In order to conform with safety requirement, it may be  item 3.6 (blue italics):
appropriate to be done during shutdown.
Because of the potential for explosion Also, if automatic purge system is provided, starting sequence should probably      of residual fuel or fuel vapor override purge process to start up the CTG within a required time.                  remaining in the CTG, the exhaust
: 8. C.3.6                                                                                      system should be purged before startup or during shut down. The starting and / or shut down sequence should include a gas purge process of the turbine to prevent damage to the turbine and downstream components by explosion.
Automatic switch to open the bypass door should not be required unconditionally. Recommend revising item 3.8 to the        1 following (or similar):
The inlet air design should consider preventing excessive increase in pressure loss due to particle
: 9. C.3.8 deposition on inlet air filter. When increase of pressure loss is not acceptable for CTG performance, inlet air filter should be removed, replaced, or cleaned without power reduction of CTG.
 
No. Section                                      Comment/Basis                                                Recommendation              Priority This item does not need to specify "under a standard load."                            Recommend changing to:                    1 Also, it seems monitoring under standard load operation is required, but item b        In addition to IEEE Std 24202019, (deposits or deterioration of the turbine blades or vanes (as inferred from ideal model Section C.3, the following items results)) cannot be monitored during operation.                                        observed under a standard load indicate the need for an overhaul and should be monitored when
: 10. C.3.12 appropriate for a CTG based on the manufacturer's recommendations: a.
decreasing run out time after shutdown, and b. deposits or deterioration of turbine blades or vanes (as inferred from ideal model results).
Background, Onsite Emergency AC Power Sources, Paragraph 6, Second Sentence:            Please revise sentence as follows:        2 Increased operational reliability can be achieved through appropriate testing and    Increased operational reliability can maintenance, as well as an effective root cause analysis of all failures of the onsite  be achieved through appropriate emergency power source.                                                                testing and maintenance per RG a) The section does not have a reference for direction here. RG 1.160,            1.160 (Monitoring the Effectiveness
: 11. B.
Monitoring the Effectiveness of Maintenance at Nuclear Power Plants, should be    of Maintenance at Nuclear Power the reference.                                                                    Plants), as well as appropriate level b) A full root cause analysis may not be warranted for each failure. In some cases,    causal analyses of all failures of the apparent cause analyses may be more effective. An appropriate level causal            onsite emergency AC power source.
analysis would be a better Clarify the fire source being considered in this guidance. Other guidance and          Add "originating from the emergency        2
: 12. C.1.13 regulations cover fires originating elsewhere.                                          AC power source" to the end of the 2nd sentence.
Clause 1.4, Inclusions for Site Testing: NRC Draft Guide recommends supplementing    Delete C.2.1. see basis.                  2 field flashing devices. Field flashing devices are already included within the scope of
: 13. C.2.1  IEEE Std 387-2017 (Section 1.3.1.b.1)
The maximum design-basis loads should be within the continuous rating (as defined      Change C.2.7 to state that IEEE Std      2 in IEEE Std 387-2017, Section 3.2) of the EDG with margin.                            387-2017, Clause 4.1.2.D, T Design Load, should be supplemented with
: 14. C.2.7 IEEE Section 4.1.2.d discusses Design load. C2.7 should be revised to reference and  the following: The maximum design-supplement this section.                                                                basis loads should be within the continuous rating (as defined in IEEE
 
No. Section                                      Comment/Basis                                                        Recommendation              Priority Std 387-2017, Section 3.2) of the EDG with margin.
This sentence seems like an opinion, and it does not provide direction. The rest of the        Delete the 7th sentence: "If test        3 paragraph already clearly states the requirements.                                            programs are not ..."
: 15. C.1.8 Item b is for Lube Oil and the IEEE Std 387 Section 4.5.1.7 is solely for Fuel Oil. If this is If a requirement for lube oil is to be    3 intended to remain in the Reg. Guide, it should be its own item.                              presented in the Reg. Guide, it should
: 16. C.2.5                                                                                                have its own section (see Comment/Basis).
Current wording only includes ISOC testing w/ plant vital bus loads, but the intent            Change a. (3) to "... planned to run      3 should be to include parallel operation at varying load levels.                                loaded for at least 1 hour at  50%
: 17. C.3.3                                                                                                continuous rating."
Editorial Comments Included Below:
 
==Purpose:==
2nd to last paragraph from Section B of Rev. 4 provides additional discussion        1. Copy 2nd to last paragraph from      N/A of purpose but was not included in this draft.                                                Section B of Rev. 4 to make 2nd paragraph of Purpose section.
: 1.        A.
: 2. Change "emergency diesel generators" to "onsite emergency AC power sources" (2x).
 
==Purpose:==
Note in Rev. 3 the root cause statement was limited to just the EDGs. In              Add clarification to be sure that this  N/A Rev. 4 and DG-1303 the wording changed to onsite emergency power source                        applies only to Class 1E GDC 17 On-potentially opens the door to failures beyond EDGs, CTGs or other sources. At first            site AC Emergency Power Sources.
glance it seems a small change but the purpose states it addresses onsite emergency alternating current (AC) power sources, including emergency diesel generators (EDGs) and combustion turbine generators (CTGs), in nuclear power plants. This RG may also
: 2.        A. be used for other types of onsite emergency AC power sources. This leaves the door open to applying the RG wording to other power sources on site.
RG 1.9 Rev. 3 High reliability,  can be achieved by appropriate testing, maintenance, and operating programs and by institution of a reliability program that implements effective root cause analysis of all emergency diesel generator failures and that is designed to monitor, improve, and maintain reliability at selected levels.
 
No. Section                                    Comment/Basis                                                  Recommendation                  Priority DG-1303, Page 7, Increased operational reliability can be achieved through appropriate testing and maintenance, as well as an effective root cause analysis of all failures of the onsite emergency power source.
Applicability: Be consistent with the use of "all." Use in both locations or neither one Delete "all" from "... and all applicants    N/A (recommended).                                                                          and ..." OR add "all" up front, as in, "...
: 3. A.                                                                                            applies to all applicants..."
Related Guidance: Be consistent with the use of "AC power" vs "ac power".                Change "ac" to "AC" under                    N/A NUREG-0800 discussion of SRP
: 4. A.                                                                                            Chapter 8.
Reason for Revision: Language not specific enough                                        Change first sentence to "This revision      N/A (Revision 5) of RG 1.9 endorses, ..."
: 5. B.
Background, Onsite Emergency AC Power Sources, Paragraph 2: The word is implied          Delete "active" from the 2nd sentence        N/A and doesn't need to be stated.                                                          of the 2nd paragraph.
: 6. B.
Background, Onsite Emergency AC Power Sources, Paragraph 2: Do not need to list          Delete "EDG, CTG, or other" from the          N/A the three types of generators every time.                                                4th sentence of the 2nd paragraph.
: 7. B.
Background, Onsite Emergency AC Power Sources, Paragraph 2: Language not specific        Add "of the emergency generator              N/A enough                                                                                  prime mover" after the word
: 8. B.                                                                                            "overspeed" in the 7th sentence of the 2nd paragraph.
Background, Onsite Emergency AC Power Sources, Paragraph 3: Awkward wording              Change the middle of the 2nd                  N/A sentence of the 3rd paragraph to "...
: 9. B.                                                                                            and selecting EDGs or CTGs with continuous ratings that exceed the sum ..."
Background, Onsite Emergency AC Power Sources, Paragraph 3: Redundant wording            Combine last 2 sentences of 3rd              N/A paragraph to "However, the DBE loads
: 10. B.                                                                                            during the operating license or COL stages should be within the
 
No. Section                                    Comment/Basis                                              Recommendation              Priority continuous (or nominal) rating of the selected onsite emergency AC power source(s) with margin."
Background, Onsite Emergency AC Power Sources, Paragraph 4: Words are implied        Delete "boiling or pressurized" from      N/A the 2nd sentence of the 4th
: 11. B.                                                                                        paragraph.
Background, Onsite Emergency AC Power Sources, Paragraph 4: Excessive/awkward        Combine the last 2 sentences of the      N/A wording                                                                              4th paragraph to "... provided with an
: 12. B.                                                                                        ECCS capable of maintaining the core temperature at an acceptably low value and removing decay ..."
Background, Onsite Emergency AC Power Sources, Paragraphs 4 & 5: The author is      Move the 1st sentence of the 5th          N/A trying to convey the continuous rating should bound ECCS loads, but long-term ECCS  paragraph to the end of the 4th
: 13. B. loads are significantly lower than during the first 2-24 hrs. The previous paragraph paragraph and delete the 2nd already said DBE loads should be within the continuous rating; this is the message  sentence of the 5th paragraph.
that needs to be conveyed. The deleted part confuses the issue.
: 2. Add "AC" for consistency.                                                        Change the last part of the last          N/A sentence in paragraph 6 to "as well as
: 14. B.                                                                                        effective root cause analyses of all failures of the onsite emergency AC power source."
Background, Emergency Diesel Generators: Information for EDGs and CTGs is            Change Section title to "Emergency        N/A redundant and should be combined into one section.                                  Diesel Generators and Combustion
: 15. B.                                                                                        Turbine Generators" Background, Emergency Diesel Generators: The concern is not limited to EDGs.        Change the 1st sentence of the 1st        N/A paragraph to 2 sentences: "Motor-starting transients can also affect the
: 16. B.                                                                                        frequency of the emergency AC power source. This is primarily an EDG concern but may apply to other generator types."
 
No. Section                                      Comment/Basis                                                  Recommendation              Priority Background, Emergency Diesel Generators: Mostly redundant/awkward wording                Delete existing 2nd and 3rd sentences    N/A of 1st paragraph and move the
: 17. B.                                                                                            revised sentences above to the beginning of the 2nd paragraph.
Background, Emergency Diesel Generators: Section is being revised to apply to more      Change the 3 uses of "EDG" in the 2nd    N/A than just EDGs                                                                          paragraph to "emergency AC power
: 18. B.                                                                                            source" (one is plural).
Background, Emergency Diesel Generators: Captures previously deleted material that      Change the last part of the 2nd          N/A was not redundant                                                                        sentence in the 2nd paragraph to "...
ECCS motor loads (e.g., pumps,
: 19. B.
motor-operated valves and fans) and bypass power supplies associated with uninterruptible power systems."
Background, Emergency Diesel Generators: Section is being revised to apply to more      1. Change 1st sentence of 3rd            N/A than just EDGs                                                                          paragraph to "Protection of an EDG or CTG from ... operation of an overspeed trip device (usually set at
: 20. B.                                                                                            115 percent of nominal speed for EDGs)."
: 2. Add "or CTGs" after "EDGs" in the 2nd and 3rd sentences of the 3rd paragraph.
Background, Emergency Diesel Generators: It is not clear the author wishes these to      Change the last 3 sentences of the 3rd  N/A be Test mode-only trips. Also, a trip obviously interferes with operation; this does not paragraph to "Conversely, spurious need to be stated.                                                                      operation of a trip circuit lowers EDG/CTG availability and reliability.
: 21. B.                                                                                            Consequently, it is important to ensure these other protective trips are only enabled in Test mode so they do not prevent the EDGs/CTGs from performing ..."
Background, Combustion Turbine Generators: The concern is not limited to CTGs.          1. Move the 1st paragraph to be the      N/A 1st paragraph of the combined EDG/CTG section.
: 22. B.
: 2. Add "EDGs or" before "CTGs" in the 1st and last sentences of the 1st paragraph.
 
No. Section                                  Comment/Basis                                              Recommendation              Priority Background, Combustion Turbine Generators: Information is redundant for combined Delete 2nd and 3rd paragraphs.            N/A EDG/CTG section.
: 23. B.
Awkward/incomplete wording                                                      Change section title to "Design and      N/A Testing Considerations for Onsite
: 24. C.1                                                                                    Emergency AC Power Sources other than EDGs and CTGs" Enhancement Suggestion: Paragraph is cumbersome and contains many items.        Consider putting the individual          N/A requirements in bullet form.
: 25. C.1.4 Consistency and grammar                                                          1. In the 5th sentence:                  N/A
: a. Change "power AC" to "AC power"
: b. Replace the comma after
: 26. C.1.4                                                                                  "controls" with "and"
: 2. Change "internal" to "internally" in the last sentence Words are implied                                                                Delete "for these plants" from the last  N/A sentence.
: 27. C.1.6 Grammar                                                                          Change "i.e." to "e.g." in the 2nd        N/A sentence.
: 28. C.1.8 Wording not copied and modified properly from IEEE 387-2017.                    Add "of the system" after "status" in    N/A the 6th sentence.
: 29. C.1.8 Awkward/incomplete wording                                                      1. Change section title to "Design and    N/A Testing Considerations for Emergency
: 30. C.2                                                                                    Diesel Generators"
: 2. Add "and testing" after "design" in the opening sentence.
 
No. Section                                    Comment/Basis                                                    Recommendation              Priority Grammar                                                                                  Delete hyphen in "lubricating-oil" in    N/A subsection b.
: 31. C.2.5 2.7 refers to IEEE 387-2017, Section 3.2. There is no Section 3.2 in IEEE 387-2017. It is Refer to Section 3 definition of          N/A Definitions Clause, second definition and should be clarified as such.                    continuous rating (of diesel generator
: 32. C.2.7                                                                                            unit)
Words are redundant to the word "independently"                                          Delete "of the redundant units" from      N/A the end of the opening sentence.
: 33. C.2.9 Awkward/incomplete wording                                                                1. Change section title to "Design and    N/A Testing Considerations for
: 34. C.3                                                                                            Combustion Turbine Generators"
: 2. Add "and testing" after "design" in the opening sentence.
Language not specific enough                                                              Add "following maintenance" after        N/A "declare the CTG operable" in the last
: 35. C.3.3                                                                                            sentence of the opening paragraph.
Grammar                                                                                  1. Change "load run" to "load/run" in    N/A 3rd paragraph of subsection c.
: 36. C.3.3                                                                                            2. Delete hyphen in "high-lubricant" in subsection c. (1).
Redundant wording                                                                        Delete "consideration" from the          N/A opening sentence.
: 37. C.3.9 Words are redundant to the word "independently"                                          Delete "of the redundant units" from      N/A the end of the opening sentence.
: 38. C.3.13 Grammar - proper nouns should be capitalized                                              1. Capitalize "technical specification    N/A surveillance requirements" and add
: 39. C.3.15                                                                                          "(TSSRs)" in the 1st sentence.
 
No. Section                                        Comment/Basis                                                  Recommendation              Priority
: 2. Change "technical specification surveillance requirement" to "TSSR" in the last sentence.
 
==References:==
: 1) IEEE 387 (2017), IEEE Standard for Criteria for Diesel Generator Units Applied as Standby Power Supplies for Nuclear Power Generating Stations.
: 2) Letter to Mr. Adrian P. Heymer, Senior Director, New Plant Development, Nuclear Energy Institute, from William Reckley, U.S. NRC, Chief, Rulemaking, Guidance, and Advanced Reactors Branch, Division of New Reactor Licensing, Office of New Reactors, dated August 22, 2007,
 
==Subject:==
Response to Nuclear Energy Institute (NEI) Letter Dated May 23, 2007 - Re: Industry Comments on Recent Guidance Documents. ML072330563}}

Revision as of 05:04, 18 January 2022

Comment (2) of Frances Pimentel on DG-1303, Application and Testing of Safety-Related Diesel Generators in Nuclear Power Plants
ML21050A428
Person / Time
Site: Nuclear Energy Institute
Issue date: 02/18/2021
From: Pimentel F
Nuclear Energy Institute
To:
Office of Administration
References
86FR5267 00002, DG-1303, NRC-2020-0279
Download: ML21050A428 (15)
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